singlet

noun sin·glet \ˈsiŋ-glət\

: a shirt that has no sleeves or collar and that is worn for playing sports

Full Definition of SINGLET

[from its having only one thickness of cloth] chiefly British : an athletic jersey; also : undershirt

: an atom or molecule that has no net electronic magnetic moment; also : an excited state of an atom or molecule that is a singlet

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circa 1746

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