Greek: ανεψιος [anepsios] (Noun Masculine). A cousin.

ανεψιος [anepsios] appears 1 time in the NT:

(1) Colossians 4: 10
Aristarchus my fellow-prisoner saluteth you, and Mark, the cousin of Barnabas (touching whom ye received commandments; if he come unto you, receive him), (American Standard Version) - ο ανεψιος [ho anepsios] Nom. sing.

- Aristarchus my fellowprisoner saluteth you, and Marcus, sister's son to Barnabas, (touching whom ye received commandments: if he come unto you, receive him;) (KJV).

Perhaps the translation "sister's son" in the KJV, reflects the text of the Vulgate, "consobrinus", that although could mean "sister's son", means "cousin": “salutat vos Aristarchus concaptivus meus et Marcus consobrinus Barnabae de quo accepistis mandata si venerit ad vos excipite illum”.

In a restricted sense, consobrinus is the designation of the children of two sisters: a mother's sister's son - sons or daughters- ; but more frequently consobrinus is used of all cousins, the children of brothers or sisters.

- a mother's sister's son - consobrinus
- a mother's brother's son - consobrinus
- a father's sister's son - amitinus - later also: consobrinus
- a father's brother's son - frater patruelis - later also: consobrinus
- a father's brother's daughter - soror patruelis - later also: consobrinus