Quick Definition
I assent to
Strong's Definition
to say jointly, i.e. assent to
Derivation: from G4862 (σύν) and G5346 (φημί);
KJV Usage: consent unto
Thayer's Greek Lexicon
σύμφημι (T WH συνφημι (cf. σύν, II. at the end)); to consent, confess: τίνι; followed by ὅτι, Rom_7:16. (Tragg., Xenophon, Plato.)
STRONGS NT 4852a: σύμφοροςσύμφορος, σύμφορον (συμφέρω, which see), fit, suitable, useful; from (Hesiod, Theognis), Herodotus down; 4Ma_5:10; a substantive, τό σύμφορον, advantage, profit: with a genitive of the person profited, L T Tr WH in 1Co_7:35; 1Co_10:33 (cf. Buttmann, § 127, 19 n.) (plural τό συμφορά, often in secular authors (from Sophocles down)).
Mounce Concise Greek Dictionary
σύμφημι symphēmi 1 x
pr. to agree with, Rom_7:16
Abbott-Smith Greek Lexicon
* σύν φημι
( Rec. συμ -),
to consent, confess: c . dat ., seq . ὅτι , Rom_7:16 .†
Liddell-Scott — Intermediate Greek Lexicon
σύμφημι fut. -φήσω aor1 συνέφησα aor2 συνέφην "to assent, approve", or "agree fully", Aesch. , etc. c. acc. rei, "to concede, agree to, grant", Plat. , Xen. ; absol., ξύμφημί σοι "I grant" you, Plat. ; ξύμφαθι ἢ ἄπειπε "say yes" or no, id=Plat. c. acc. et inf. "to agree" that . . , Soph. , Plat. c. inf. fut. "to promise", Xen.
STEPBible — Tyndale Abridged Greek Lexicon
σύν φημι (Rec. συμ-),
to consent, confess: with dative, before ὅτι, Rom.7:16.†
(AS)