2644. katallassó
Lexical Summary
katallassó: Reconcile, restore to favor

Original Word: καταλλάσσω
Part of Speech: Verb
Transliteration: katallassó
Pronunciation: kat-al-las'-so
Phonetic Spelling: (kat-al-las'-so)
KJV: reconcile
NASB: reconciled, reconciling
Word Origin: [from G2596 (κατά - according) and G236 (ἀλλάσσω - changed)]

1. to change mutually
2. (figuratively) to reconcile

Strong's Exhaustive Concordance
reconcile.

From kata and allasso; to change mutually, i.e. (figuratively) to compound a difference -- reconcile.

see GREEK kata

see GREEK allasso

HELPS Word-studies

2644 katallássō (from 2596 /katá, "down to an exact point," intensifying 236 /allássō, "to change") – properly, decisively change, as when two parties reconcile when coming ("changing") to the same position.

2644 /katallássō ("decisively changed, reconciled") is applied to marriage partners (1 Cor 7:11), but usually in the redemptive sense of a sinner reconciling to the Lord.

[2644 (katallássō) was originally used for the exchange of coins; "properly, to change, exchange (especially of money); hence, of persons, to change from enmity to friendship, to reconcile" (A-S).]

NAS Exhaustive Concordance
Word Origin
from kata and allassó
Definition
to reconcile
NASB Translation
reconciled (5), reconciling (1).

Thayer's Greek Lexicon
STRONGS NT 2644: καταλλάσσω

καταλλάσσω; 1 aorist participle καταλλαξας; 2 aorist passive κατηλλάγην; properly, to change, exchange, as coins for others of equal value; hence, to reconcile (those who are at variance): τινας, as τούς Θηβαιους καί τούς Πλαταιεας, Herodotus 6, 108; κατηλλαξαν σφεας οἱ Παριοι, 5, 29; Aristotle, oecon. 2, 15, 9 (p. 1348b, 9) κατήλλαξεν αὐτούς πρός ἀλλήλους; passive τίνι, to return into favor with, be reconciled to, one, Euripides, Iph. Aul. 1157; Plato, rep. 8, p. 566 e.; πρός ἀλλήλους, Thucydides 4, 59; but the passive is used also where only one ceases to be angry with another and receives him into favor; thus καταλλαγεις, received by Cyrus into favor, Xenophon, an. 1, 6, 1; καταλλάττεται πρός αὐτήν, regained her favor, Josephus, Antiquities 5, 2, 8; and, on the other hand, God is said καταλλαγῆναι τίνι, with whom he ceases to be offended, to whom he grants his favor anew, whose sins he pardons, 2 Macc. 1:5 2Macc. 7:33 2Macc. 8:29; Josephus, Antiquities 6, 7, 4 cf. 7, 8, 4 (so ἐπικαταλλάττεσθαι τίνι, Clement of Rome, 1 Cor. 48, 1 [ET]). In the N. T. God is said καταλλάσσειν ἑαυτῷ τινα, to receive one into his favor (A. V. reconcile one to himself), 2 Corinthians 5:18f (where in the added participles two arguments are adduced which prove that God has done this: first, that he does not impute to men their trespasses; second, that he has deposited the doctrine of reconciliation in the souls of the preachers of the gospel); καταλλαγῆναι τῷ Θεῷ, to be restored to the favor of God, to recover God's favor, Romans 5:10 (but see ἐχθρός, 2); καταλλάγητε τῷ Θεῷ, allow yourselves to be reconciled to God; do not oppose your return into his favor, but lay hold of that favor now offered you, 2 Corinthians 5:20. of a woman: καταλλαγήτω τῷ ἀνδρί, let her return into harmony with (A. V. be reconciled to) her husband, 1 Corinthians 7:11. Cf. Fritzsche on Romans, vol. i., p. 276ff (who shows (in opposition to Tittmann, N. T. Synonyms, 1:102, et al.) that καταλλάσσω and διαλλάσσω are used promiscuously; the prepositions merely intensify (in slightly different modes) the meaning of the simple verb, and there is no evidence that one compound is stronger than the other; διαλλάσσω and its derivatives are more common in Attic, καταλλάσσω and its derivatives in later writers. Compare: ἀποκαταλλάσσω.

Topical Lexicon
Topic Overview – καταλλάσσω (Strong’s Greek 2644)

The verb denotes bringing estranged parties into harmony. In Scripture its principal focus is the restoration of sinners to God through the atoning work of Jesus Christ, with a secondary application to human relationships.

New Testament Usage

1. Divine-Human Reconciliation
Romans 5:10; 2 Corinthians 5:18-20 present reconciliation as a finished act accomplished “through the death of His Son,” yet with ongoing results—“having been reconciled, we shall be saved by His life” (Romans 5:10).
• The initiative is entirely God’s: “All this is from God, who reconciled us to Himself through Christ” (2 Corinthians 5:18). Human hostility is overcome not by negotiation but by substitutionary sacrifice.

2. The Ministry and Message Entrusted to Believers
• Having experienced reconciliation, believers become “ambassadors for Christ” (2 Corinthians 5:20), commissioned to herald the appeal: “Be reconciled to God.”
• The ministry involves both proclamation (“message of reconciliation,” 2 Corinthians 5:19) and representation (“God making His appeal through us,” 5:20), underscoring the inseparability of gospel content and gospel living.

3. Interpersonal Application
• In 1 Corinthians 7:11 the term governs a broken marriage: “let her…be reconciled to her husband.” Having been reconciled to God, disciples pursue reconciliation with others, reflecting divine grace in practical relationships (cf. Matthew 5:23-24).

Historical Background

First-century Greco-Roman culture spoke of reconciliation primarily in political or personal disputes. Paul adopts the common term yet fills it with covenantal depth: enemies of God become His children. Unlike pagan cults, no ritual initiated by humans secures peace; the cross stands as God’s unilateral act.

Theological Significance

• Substitutionary Atonement: Reconciliation presupposes alienation due to sin (Romans 5:10; Colossians 1:21-22). The death of Christ satisfies divine justice, removing the barrier.
• Union with Christ: Having been reconciled, believers share Christ’s resurrected life (Romans 5:10), guaranteeing final salvation.
• New Creation: 2 Corinthians 5:17-19 locates reconciliation within the broader scope of re-creation; peace with God inaugurates cosmic renewal.

Practical and Ministerial Implications

• Evangelism: The church carries a diplomatic mandate; faithful gospel witness is framed as an urgent plea from the King to rebels.
• Discipleship: Assurance flows from the completed fact—“God was reconciling the world to Himself in Christ, not counting men’s trespasses against them” (2 Corinthians 5:19).
• Community Life: Reconciled people pursue unity, racial harmony, and marital restoration, modeling the peace already secured at the cross (Ephesians 2:14-16 applies the same concept to Jew-Gentile unity).
• Pastoral Counseling: In marital or relational strife, 1 Corinthians 7:11 guides toward restoration, balanced by realism regarding repentance and safety.

Related Terms and Concepts

• καταλλαγή (reconciliation, the noun form) – the state achieved by the verb.
• ἱλάσκομαι / ἱλαστήριον (propitiation) – the means by which reconciliation is obtained.
• εἰρήνη (peace) – the resultant state between God and the reconciled.

Summary

Strong’s 2644 highlights the heart of the gospel: God brings His enemies into intimate fellowship through Christ’s sacrificial death and victorious life. This finished work becomes the church’s living message, shaping evangelism, ethics, and relationships until the whole creation shares in the fullness of divine-human peace.

Forms and Transliterations
καταλλαγεντες καταλλαγέντες καταλλαγητε καταλλάγητε καταλλαγητω καταλλαγήτω καταλλαξαντος καταλλάξαντος καταλλασσων καταλλάσσων κατελογίσθης κατηλλαγημεν κατηλλάγημεν κατήλλαξε katallagentes katallagéntes katallagete katallagēte katallágete katallágēte katallageto katallagētō katallagḗto katallagḗtō katallasson katallassōn katallásson katallássōn katallaxantos katalláxantos katellagemen katellágemen katēllagēmen katēllágēmen
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Englishman's Concordance
Romans 5:10 V-AIP-1P
GRK: ἐχθροὶ ὄντες κατηλλάγημεν τῷ θεῷ
NAS: while we were enemies we were reconciled to God
KJV: enemies, we were reconciled to God
INT: enemies being we were reconciled to God

Romans 5:10 V-APP-NMP
GRK: πολλῷ μᾶλλον καταλλαγέντες σωθησόμεθα ἐν
NAS: more, having been reconciled, we shall be saved
KJV: more, being reconciled, we shall be saved
INT: much more having been reconciled we will be saved by

1 Corinthians 7:11 V-AMP-3S
GRK: τῷ ἀνδρὶ καταλλαγήτω καὶ ἄνδρα
NAS: or else be reconciled to her husband),
KJV: or be reconciled to [her] husband:
INT: to the husband be reconciled and husband

2 Corinthians 5:18 V-APA-GMS
GRK: θεοῦ τοῦ καταλλάξαντος ἡμᾶς ἑαυτῷ
NAS: who reconciled us to Himself
KJV: God, who hath reconciled us to himself
INT: God having reconciled us to himself

2 Corinthians 5:19 V-PPA-NMS
GRK: Χριστῷ κόσμον καταλλάσσων ἑαυτῷ μὴ
NAS: was in Christ reconciling the world
KJV: Christ, reconciling the world
INT: Christ [the] world reconciling to himself not

2 Corinthians 5:20 V-AMP-2P
GRK: ὑπὲρ Χριστοῦ καταλλάγητε τῷ θεῷ
NAS: of Christ, be reconciled to God.
KJV: stead, be ye reconciled to God.
INT: for Christ Be reconciled to God

Strong's Greek 2644
6 Occurrences


καταλλάγητε — 1 Occ.
καταλλαγήτω — 1 Occ.
καταλλαγέντες — 1 Occ.
καταλλάσσων — 1 Occ.
καταλλάξαντος — 1 Occ.
κατηλλάγημεν — 1 Occ.

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