The wife of one's uncle or aunt (parent's sibling).
The aunt of one's husband.
The aunt of one's wife.
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).