Definitions of nephew

1. a son of your brother or sister

2. A cousin.

3. The son of a brother or a sister, or of a brother- in- law or sister- in- law.

4. ( orig.) A grandson- so in New Test.; the son of a brother or sister:- fem. NIECE.

5. Son of a brother or sister.

6. The son of a brother or sister; fem. niece.