ten thousand: the largest counting unit ancient Greek had, used both for that exact amount and, more often, for a crowd past counting
TranslatabilityPartialCertaintySettled
Greek counting topped out at ten thousand. There was no ordinary word for a million, so a writer who needed a bigger figure had to build one by multiplying this unit by itself. That ceiling is why the word does two jobs at once. It names a precise quantity when someone is actually totaling something up, and it names sheer immensity when nobody is counting at all.
Acts 19:19 is the plain arithmetic case: the burned books are valued at five of these units, fifty thousand silver coins. In Luke 12:1 and Acts 21:20 nobody has taken a headcount, and the word is simply the strongest way Greek had of saying that a crowd was beyond reckoning. Revelation stands between the two, announcing that it is reporting a number and then giving one built by stacking the biggest unit on itself.
One step below it sits the thousand (χιλιάς), which Revelation 5:11 pairs with it to pile figure on figure. The matching counting word (μύριοι) counts ten thousand of something, or on its own simply means "countless". And the Greek translators of the Old Testament reached for this word to render the Hebrew term for a myriad (רְבָבָה), which is why the picture of God arriving with countless holy ones in Deuteronomy 33:2 sounds the way it does when Jude 1:14 echoes it.
Nuances
1aten thousand as an actual counted figure, including the huge numbers built by multiplying it
TranslatabilityApproximate
Act 19:19Rev 5:11 (2×)*Rev 9:16*
Rev 9:16
Whether the number of the cavalry in Revelation 9:16 is a quantity to be taken at face value or a conventional way of saying a host beyond counting.
majorityThe doubled myriad is symbolic, following the Jewish habit of stacking the largest numeral to express an innumerable host rather than a headcount.; G. K. Beale, The Book of Revelation, New International Greek Testament Commentary (Grand Rapids: Eerdmans, 1999), on Revelation 9:16
minorityThe figure belongs with the definite-number uses of the word, since John presents it as a number he heard reported.; BDAG, 3rd ed. (Chicago: University of Chicago Press, 2000), s.v. μυριάς; David E. Aune, Revelation 6-16, Word Biblical Commentary 52B (Nashville: Thomas Nelson, 1998), on Revelation 9:16
1ba crowd so large that nobody is counting it: countless thousands
This is the bigger of the two units, usually rendered "ten thousand", and the writers reach for it when the point is that a crowd is past counting rather than that a total has been reached. Luke says the crowd around Jesus gathered in such numbers that people were trampling one another, and the leaders in Jerusalem tell Paul how many believers there now are among the Jews without ever naming a figure.Luk 12:1Act 21:20
It is the word chosen for a company that belongs to heaven rather than to any human head count: the angels gathered in festival at the heavenly city, and the holy ones who come with the Lord.Heb 12:22Jud 1:14
Because the unit itself is so large, one small number in front of it names a sum that would take five digits to write out, as with the price of the burned books of magic, and it can be doubled and then multiplied by itself to size a cavalry beyond imagining.Act 19:19Rev 9:16
Both
Both are round units of counting, and both are piled into plurals in the same sentence to describe the gathering around the throne, where the number is heard as thousands of thousands and ten thousands of ten thousands together.Rev 5:11
Both are used to size a fighting force, whether the two armies a king weighs against each other before going to war or the mounted troops counted in the vision.Rev 9:16Luk 14:31
This is the ordinary counting unit for exact totals, the figure a reporter gives when the number is meant to be taken as a real count: about five thousand men after Peter preached, twenty three thousand who fell in a single day in the wilderness, seven thousand killed in the earthquake.Act 4:41Co 10:8Rev 11:13
It carries the careful arithmetic of the sealed multitude in Revelation, twelve thousand from each tribe adding up to the hundred and forty four thousand who later stand with the Lamb and sing the new song.Rev 7:4Rev 7:5Rev 14:1Rev 14:3
It also counts things that are not people at all, such as the measured length of the city walls given in units of distance.Rev 21:16
μύριοιthe matching counting word: used to count ten thousand of something, and on its own it can simply mean "countless"
This is the word for a group of ten thousand that can itself be counted and multiplied, so it stacks up. Five of them make the price of the burned scrolls in Acts 19:19, and Revelation piles them onto themselves, first as myriads of myriads and then doubled again for the army of horsemen.Act 19:19Rev 5:11Rev 9:16
The huge number is the thing actually being spoken of, and whoever makes it up is added afterward as a description: the crowd in Luke 12:1, the believing Jews in Acts 21:20, the angels in Hebrews 12:22.Luk 12:1Act 21:20Heb 12:22
It is the New Testament's word for the assembled hosts of heaven, whether gathered in worship around the throne or coming with the Lord to judge.Heb 12:22Jud 1:14Rev 5:11
Both
Both can mean nothing more precise than "far too many to count", with no interest in an exact total: the believers of Acts 21:20 and the guardians of 1 Corinthians 4:15 are alike past tallying.Act 21:201Co 4:15
Both are used of money, where the figure reads as a real sum being reckoned rather than a flourish: the value of the burned scrolls in Acts 19:19 and the debt brought to the king in Matthew 18:24.Act 19:19Mat 18:24
This word sits directly in front of whatever is being counted and simply says how many of them there are, rendered "ten thousand" every time: that many talents of debt, that many guardians, that many words.Mat 18:241Co 4:151Co 14:19
Every use sets the enormous figure against a small one to make a point in an argument: a debt no one could pay beside the trifling one its servant refused to cancel, countless guardians beside a single father, ten thousand words in a tongue beside five that people can understand.Mat 18:241Co 4:151Co 14:19
πλῆθοςa large gathering seen as one mass, with no counting unit behind it at all
It is a real number word, worth "ten thousand", so it can report an exact figure: five myriads of silver coins burned at Ephesus, and a cavalry force whose total John says he actually heard counted.Act 19:19Rev 9:16
Because it is a number, it can be stacked on itself to push past arithmetic, myriads of myriads, a way of saying "beyond counting" that a plain crowd word has no means of doing.Rev 5:11Rev 9:16
It is the standard word for the countless heavenly host, the armies of angels and holy ones that come with God.Heb 12:22Jud 1:14
Both
Both describe a press of people so large that no one is counting, and English Bibles reach for the same words for each, usually rendered "multitude" or "thousands".Luk 12:1Luk 6:17Luk 19:37
Both are used for how fast the early church grew, measuring the believers in numbers nobody could keep track of.Act 21:20Act 5:14
It names an organized body that acts as one and can be summoned, addressed, or fall silent, which is why it covers the gathered church as a whole assembly rather than a headcount.Act 6:2Act 15:12Act 15:30Act 4:32
It is not limited to people at all: it covers a heavy catch of fish, an armful of brushwood, and a pile of sins that love covers over.Luk 5:6Jhn 21:6Act 28:3Jas 5:201Pe 4:8
A crowd named this way has a mood and can be swayed, split down the middle, or pressed into a mob that shouts for a man's death.Act 14:4Act 23:7Act 21:36Luk 23:27
murias in the other biblical languages
רְבָבָהHebrew“myriad”the Hebrew word for a myriad that this Greek word normally translates, used of armies, of holy ones, and of vast populations
Works as a plain arithmetic multiplier in everyday reckoning, so a money total is reported as an exact figure with no poetic coloring: five of these units of silver, that is fifty thousand.Act 19:19
Gets multiplied by itself to reach the largest numbers anywhere in Scripture, so the word stacks on its own to push a total past what anyone could tally: myriads of myriads around the throne, and twice ten thousand times ten thousand cavalry.Rev 5:11Rev 9:16
Both
Both are the top ordinary counting word of their language, and both slide from a figure into "more people than anyone can number" when a crowd is in view.Psa 3:6Luk 12:1
Both describe the vast company of holy ones who come with the Lord, and the New Testament scene of his arrival with his tens of thousands reuses the older picture of him coming from Sinai with them.Deu 33:2Jud 1:14
Both size up the people of God themselves, whether the tens of thousands of Israel on the march or the tens of thousands of believing Jews reported in Jerusalem.Num 10:36Act 21:20
Sits in a set poetic escalation beside the word for a thousand, where the second line always outbids the first: a hundred chase ten thousand, two put ten thousand to flight, Saul killed his thousands and David his ten thousands.Lev 26:8Deu 32:301Sa 18:7
Serves as a blessing of countless offspring and of sheer growth, wishing a bride into the mother of tens of thousands and describing a foundling grown up into a multitude.Gen 24:60Ezk 16:7
Marks a superlative by supplying the crowd a single figure stands out from, so the beloved is the one picked out from ten thousand others.Sng 5:10
Measures an absurd quantity of offering as a way of asking whether any amount could ever be enough, piling up tens of thousands of rivers of oil.Mic 6:7
רִבּוֹAramaic“myriad”the Aramaic form behind Daniel 7:10, whose ten thousand times ten thousand attending God supplies the wording of Revelation 5:11
The Greek word counts ordinary people on the ground, not only ranks in heaven. It describes the crowd packed around Jesus until they were stepping on each other, and the huge number of Jewish believers in Jerusalem.Luk 12:1Act 21:20
It can work as a plain unit of arithmetic in a running total. When the magic books were burned in Ephesus, their value came to five of these units, which is why English Bibles say "fifty thousand" pieces of silver.Act 19:19
It can number a hostile force being mustered for attack, sizing up an army of cavalry rather than a household of attendants.Rev 9:16
It names the company that travels with the Lord when he arrives, the holy ones who come with him, so the multitude is on the move rather than waiting in place.Jud 1:14
Both
Both words name the largest round number their language counts with, and both are usually rendered "ten thousand" even when no one is expected to add anything up. Each is reached for when a gathering is simply past counting.Dan 7:10Heb 12:22
The Greek word is how this Aramaic number word carries into the New Testament. John's throne room vision stacks the very same two figures Daniel saw, the myriads and the thousands of thousands, in the same order and around the same throne.Dan 7:10Rev 5:11
Both can be multiplied by themselves to push past any figure a reader could hold, giving a number of the form "ten thousand times ten thousand" rather than a countable total.Dan 7:10Rev 9:16
The Aramaic word survives in a single scene, the courtroom of the Ancient of Days as the thrones are set and the books are opened. It never gets stretched to money, marketplaces, or armies, so its whole range is one moment of heavenly judgment.Dan 7:10
Its multitude is a court already in place, standing before the throne as the session begins, rather than a crowd that gathers or an escort that arrives.Dan 7:10
What scholars say about murias
The lexica divide μυριάς into two heads: the definite unit of ten thousand (Acts 19:19, together with the compounded figures of Rev 5:11 and 9:16) and hyperbolic use for vast, uncounted numbers (Luke 12:1;Acts 21:20;Heb 12:22; Jude 14). LSJ documents the same double duty across classical and Hellenistic Greek, where the myriad is the highest named unit of the numeral system and its self-multiplication is the standard device for quantities beyond it. In the Septuagint μυριάς is the regular rendering of רְבָבָה and its cognates; Deut 33:2 supplies the diction of the theophany quoted at Jude 14 (via 1 Enoch 1:9), and Dan 7:10, with its μύριαι μυριάδες attending the Ancient of Days, that of Rev 5:11. Commentators on Revelation divide over whether the compounded numbers there are arithmetical or a Semitic idiom of innumerability, but the lexical value of the noun itself is not in dispute.
Sources
BDAG, 3rd ed. (Chicago: University of Chicago Press, 2000), s.v. μυριάςlexicon
LSJ, A Greek-English Lexicon, 9th ed. with revised supplement (Oxford: Clarendon, 1996), s.v. μυριάςlexicon
G. K. Beale, The Book of Revelation, New International Greek Testament Commentary (Grand Rapids: Eerdmans, 1999), on Revelation 5:11 and 9:16commentary
David E. Aune, Revelation 6-16, Word Biblical Commentary 52B (Nashville: Thomas Nelson, 1998), on Revelation 9:16commentary