noun
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(playing cards) A playing card that is the only one of its suit in a hand, especially at bridge.
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(playing cards) A hand containing only one card of a certain suit.
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A single object, especially one of a group.
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(computing) A class that may not be instantiated more than once, i.e. that implements the singleton design pattern.
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(mathematics) A set with exactly one element.
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A child or animal that is born singly, not as a twin or other multiple birth.
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A person without a romantic partner.
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A person without a dissociative identity.
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(phonetics) A single consonant, as opposed to a geminated consonant.
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(backgammon) Synonym of blot
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(education) A class offered only once within a school year.