Strong's Concordance

Original word: συμμαρτυρέω
Transliteration: summartureó
Definition (short): testifies
Definition (full): to testify or bear witness with

NAS Exhaustive Concordance

Word Origin: from sun and martureó
Definition: to testify or bear witness with
NASB Translation: bearing witness (1), testifies (2).
NAS Exhaustive Concordance of the Bible with Hebrew-Aramaic and Greek Dictionaries.
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Strong's Exhaustive Concordance

From sun and martureo; to testify jointly, i.e. Corroborate by (concurrent) evidence -- testify unto, (also) bear witness (with).

see GREEK sun

see GREEK martureo

KJV: Which shew the work of the law written in their hearts, their conscience also bearing witness, and their thoughts the mean while accusing or else excusing one another;)
NASB: in that they show the work of the Law written in their hearts, their conscience bearing witness and their thoughts alternately accusing or else defending them,
KJV: The Spirit itself beareth witness with our spirit, that we are the children of God:
NASB: The Spirit Himself testifies with our spirit that we are children of God,
KJV: I say the truth in Christ, I lie not, my conscience also bearing me witness in the Holy Ghost,
NASB: I am telling the truth in Christ, I am not lying, my conscience testifies with me in the Holy Spirit,