UN Definition
(colloquial) One (a thing).
(colloquial, facetious, chiefly UK) One (a person).
Origin of UN
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Middle English from Old English on- alteration (influenced by un- not) of ond-, and-, an- against, opposing ant- in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition
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Middle English from Old English ne in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition
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Representing non-standard pronunciation of one.
From Wiktionary
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From Latin ūnus (“one”)
From Wiktionary