First-cousin definition

The son or daughter of one's uncle or aunt.
noun
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A person who shares common grandparents but not common parents.
noun
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The definition of a first cousin is the son or daughter of one of your parent's siblings.

An example of a first cousin is your aunt's child.

noun
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A child of a parent's sibling. A nephew or niece of a parent.
noun
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Other Word Forms

Noun

Singular:
first-cousin
Plural:
first-cousins