to be enough: for a supply to cover the need, and so, of a person, to treat what one already has as enough
The whole word turns on one idea: there is enough. What shifts from verse to verse is only who is being measured.
Usually the subject is the supply, and the question is whether it will cover a need. Philip does the arithmetic on the hillside and says two hundred days' wages would not buy enough bread (John 6:7), and the wise bridesmaids say their oil will not stretch to cover both groups (Matthew 25:9). The two most quoted lines use that same everyday word for something nobody can count out: show us the Father "and it is enough for us" (John 14:8), and "my grace is sufficient for you" (2 Corinthians 12:9). Neither is a promise that more is coming. Both say that nothing more is needed.
Turn the word around so the person is the subject and it means treating what you already have as enough. English Bibles say "content," and the New Testament reaches for the word whenever money is in view: a soldier's pay (Luke 3:14), food and clothing (1 Timothy 6:8), a life free from the love of money (Hebrews 13:5). Its one negative use is Diotrephes, who is not satisfied with slandering the apostle and goes on to expel people from the church (3 John 1:10). A close relative, the word for a person who needs no outside supply (αὐτάρκης), is what Paul uses in Philippians 4:11 for the same settled state.
That is why these are one word and not two. Contentment here is not first of all a mood or a temperament. It is a judgment about supply, made from the inside: the person who is content has decided that what is in hand covers what is needed.