a person or thing occurring singly, especially an individual set apart from others.

a child or animal that is the only one born at one birth:
a research program involving twins and singletons.
an only child in a family.

Chiefly British. an unmarried person; a single.
Cards. a card that is the only one of a suit in a hand.
Mathematics. a set consisting of one given element.
(bridge) an original holding of one card only in a suit
a single object, individual, etc, separated or distinguished from a pair or group
(maths) a set containing only one member
a person who is neither married nor in a relationship


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