Lexical Definition

‎συμμαρτυρέω‎ symmartyréō (soom-mar-too-reh'-o) to testify with G:V
from ‎σύν‎ and ‎μαρτυρέω‎

testify unto, (also) bear witness (with).

Usage: 4 forms in 6 verses
Form Translated As     In Verse(s)
συνεμαρτυρόμην I bore witness LXX.Jer.11.7LXX.Jer.11.7
συμμαρτυρόμενοσ bearing witness together LXX.Jer.11.7
συμμαρτυρούσησ are bearing witness Rom.2.15
while is bearing witness Rom.9.1
συμμαρτυρεῖ bears witness with Rom.8.16

Abbott-Smith

* συν-μαρτυρέω (Rec. συμμ-), -ῶ,
to bear witness with: Ro 2:15; c. dat., Ro 8:16; seq. ὅτι, Ro 9:1.†

Abbott-Smith References

Book Refs
Romans 2:15 · 8:16 · 9:1

Liddell-Scott-Jones

συμμαρτυρέω,

bear witness with or in support of another, ξυμμαρτυρῶ σοι [Refs 5th c.BC+]; τι to a fact, [Refs 6th c.BC+]; followed by a relative, ὡς.. σύ μοι ξυμμαρτυρῇς οἵα πέφυκα [Refs 5th c.BC+]

__2 Astrology texts, to be in aspect with, configurate with, [Refs 2nd c.AD+]