The child of a person's uncle or aunt; a first cousin.
Something kindred or related to something else.
Any relation who is not a direct ancestor or descendant but part of one's extended family; one more distantly related than an uncle, aunt, granduncle, grandaunt, nephew, niece, grandnephew, grandniece, etc.
A member of the British intelligence services (from an American perspective) or of the American intelligence services (from a British perspective).
A son of one's cousin or cousin-in-law
A son of one's sibling, brother-in-law, or sister-in-law; either a son of one's brother (fraternal nephew) or a son of one's sister (sororal nephew).