Source: https://bibliaportugues.com/greek/3670.htm
Timestamp: 2019-04-18 12:15:17+00:00

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Definition: (a) I promise, agree, (b) I confess, (c) I publicly declare, (d) a Hebraism, I praise, celebrate.
3670 homologéō (from 3674 /homoú, "together" and 3004 /légō, "speak to a conclusion") – properly, to voice the same conclusion, i.e. agree ("confess"); to profess (confess) because in full agreement; to align with (endorse).
2. universally, to concede; i. e.
a. not to refuse, i. e. to promise: τίνι τήν ἐπαγγελίαν, Acts 7:17 L T Tr WH (here R. V. vouchsafe); followed by an object. infinitive, Matthew 14:7 (Plato, Demosthenes, Plutarch, others).
b. not to deny, i. e. to confess; declare: joined with οὐκ ἀρνεῖσθαι, followed by direct discourse with recitative ὅτι, John 1:20; followed by ὅτι, Hebrews 11:13; τίνι τί, ὅτι, Acts 24:14; to confess, i. e. to admit or declare oneself guilty of what one is accused of: τάς ἁμαρτίας, 1 John 1:9 (Sir. 4:26).
3. to profess (the difference between the Latin profiteor (`to declare openly and voluntarily') and confiteor (`to declare fully,' implying the yielding or change of one's conviction; cf.pro fessio fidei, confessio peccatorum) is exhibited in Cicero, pro Sest. 51, 109), i. e. to declare openly, speak out freely (A. V. generally confess; on its construction see Buttmann, § 133, 7): (followed by an infinitive, εἰδέναι Θεόν, Titus 1:16); τίνι (cf. Buttmann, as above; Winer's Grammar, § 31, 1 f.) followed by direct discourse with ὅτι recitative, Matthew 7:23; one is said ὁμολογεῖν that of which he is convinced and which he holds to be true (hence, ὁμολογεῖν is distinguished from πιστεύειν in John 12:42; Romans 10:9f): the passive absolute, with στόματι (dative of instrum.) added, Romans 10:10; τί, Acts 23:8; τινα with a predicate accusative (Buttmann, as above), αὐτόν Χριστόν, John 9:22; κύριον (predicate accusative) λησουν, Romans 10:9 (here WH τό ῤῆμα ... ὅτι κύριος etc., L marginal reading Tr marginal reading simply ὅτι etc.; again with ὅτι in 1 John 4:15); Ἰησοῦν Χριστόν ἐν σαρκί ἐληλυθότα (Tr marginal reading WH marginal reading ἐληλυθεναι), 1 John 4:2 and Rec. also in 3 (see below); ἐρχόμενον ἐν σαρκί, 2 John 1:7 (cf. Buttmann, as above; Winer's Grammar, 346 (324)); τινα, to profess oneself the worshipper of one, 1 John 4:3 (here WH marginal reading λύει, cf. Westcott, Epistles of John, p. 156ff) and G L T Tr WH in ; ἐν with a dative of the person (see ἐν, I. 8 c.), Matthew 10:32; Luke 12:8; with cognate accusative giving the substance of the profession (cf. Buttmann, § 131, 5; Winer's Grammar, § 32, 2), ὁμολογίαν, 1 Timothy 6:12 (also followed by περί τίνος, Philo de mut. nom. § 8); τό ὄνομα τίνος, to declare the name (written in the book of life) to be the name of a follower of me, Revelation 3:5 G L T Tr WH.
From a compound of the base of homou and logos; to assent, i.e. Covenant, acknowledge -- con- (pro-)fess, confession is made, give thanks, promise.

References: V. 
 V. 
 § 133
 § 31
 § 131
 § 32
 § 8