Strong's Concordance

Original word: ἀνεψιός
Transliteration: anepsios
Definition (short): cousin
Definition (full): a cousin

NAS Exhaustive Concordance

Word Origin: of uncertain origin
Definition: a cousin
NASB Translation: cousin (1).
NAS Exhaustive Concordance of the Bible with Hebrew-Aramaic and Greek Dictionaries.
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Strong's Exhaustive Concordance

From a (as a particle of union) and an obsolete nepos (a brood); properly, akin, i.e. (specially) a cousin -- sister's son.

see GREEK a

KJV: Aristarchus my fellowprisoner saluteth you, and Marcus, sister's son to Barnabas, (touching whom ye received commandments: if he come unto you, receive him;)
NASB: Aristarchus, my fellow prisoner, sends you his greetings; and also Barnabas's cousin Mark (about whom you received instructions; if he comes to you, welcome him);