a strong contrasting word that does not merely set two things side by side but cancels the first and puts the second in its place: but, rather, on the contrary
ἀλλά is built on the word ἄλλος ("other"), and its core force is that whatever it introduces replaces or corrects what came before. Every major grammar calls it stronger than its cousin δέ: δέ simply notes a new step in the thought, while ἀλλά cancels an expectation and puts something else in its place. That one job, correct and replace, runs through all its uses, from the sharpest "not X but Y" all the way to a gentle redirect at the start of a command.
The word is common in the New Testament, with 638 occurrences, and it is especially thick in Paul, whose argumentative style of raising and answering objections multiplies it. The Greek Old Testament (the Septuagint) uses it less freely, preferring καί ("and") and δέ, though ἀλλά does appear often where the Hebrew has the phrase "but rather" (כי). The whole range of uses found in older Greek survives into the Greek of the New Testament.
Modern scholars who study how Greek words signal the flow of an argument hold that the word really has only one instruction: ἀλλά tells the reader to cancel a prior expectation, whether that expectation was stated outright or merely implied, and to adopt the replacement instead. Older reference grammars describe the same evidence by sorting it into a family of labeled uses. Both descriptions fit the text; the single-instruction account is simpler and better explains why ἀλλά can correct an unstated expectation even where no "not" comes before it.
Nuances
Disputed
Whether ἀλλά has multiple semantic senses or a single procedural meaning whose surface effects vary by context.
- majorityOne procedural constraint: ἀλλά corrects an expectation (overt or implied) and replaces it with a new element. The traditional named "senses" (adversative, ascensive, apodotic, hortatory) are contextual effects of this single instruction, not distinct lexical meanings.; Runge, Steven E. Discourse Grammar of the Greek New Testament. Lexham, 2010, pp. 93, 57.; Levinsohn, Stephen H. Discourse Features of New Testament Greek. 2nd ed. SIL, 2000, §4.1.; Jensen, Aaron Michael. 'Can ἀλλά and γάρ Really Mark an Inference? A Defense of the "Core Constraint" Approach.' Biblical and Ancient Greek Linguistics 10 (2021): 49-72.; Heckert, Jakob K. Discourse Function of Conjoiners in the Pastoral Epistles. SIL, 1996, p. 23.
- minorityἀλλά has a strong adversative core with a distinguishable fan of secondary senses: corrective, ascensive (ἀλλὰ καί), apodotic, hortatory/inceptive, and exceptive (ἀλλ' ἤ), each assignable in context.; BDAG, 3rd ed., s.v. ἀλλά, pp. 44-45.; Blass, F. and A. Debrunner. A Greek Grammar of the New Testament. Trans. R. Funk. §448.; Wallace, Daniel B. Greek Grammar Beyond the Basics. Zondervan, 1996, pp. 669-73.; Robertson, A. T. Grammar of the Greek New Testament in the Light of Historical Research. 4th ed. Broadman, 1934, pp. 1185-88.
Whether the negation in οὐ…ἀλλά is absolute (the first clause is fully excluded) or relative (it is merely subordinated or qualified).
- contestedIn many NT instances οὐ…ἀλλά means "not so much X as Y" rather than an absolute exclusion of X; the first clause retains relevance as a foil for the corrective.; Robertson, A. T. Grammar of the Greek New Testament, 1186, citing Mark 9:37; John 12:44; Matthew 10:20; 1 Corinthians 1:17; 1 Thessalonians 4:8.; BDAG, 3rd ed., s.v. ἀλλά, sense 1.b.; Blass, F. and A. Debrunner. §448(1): 'not so much ... as.'; Silva, Moisés. Biblical Words and Their Meaning. Rev. ed. Zondervan, 1994, pp. 153-55.
- contestedThe apparent relative-negation cases are a discourse phenomenon (the negative retains relevance as a point of departure in Levinsohn's "point/counterpoint set") but do not require a separate sub-sense of ἀλλά.; Levinsohn, Stephen H. Discourse Features of New Testament Greek. 2nd ed. §7.1.; Thrall, Margaret E. Greek Particles in the New Testament. Brill, 1962, ch. 2.