Meaning of “the UN” in the English Dictionary

"un-" in American English

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un-prefix

us /ʌn/

used to add the meaning "not," "lacking," or "the opposite of" to adjectives, adverbs, verbs, and nouns:

unaided; unalterable; unaltered; unanticipated; unappreciated; unapproachable; unassigned; unassisted; unattainable; unbiased; uncommunicative; unconfined; unconvinced; uncultured; undefined; undiminished; uneconomical; unlicensed; unmodified; unmonitored; unmotivated; unobtainable; unpublished; unregulated; unrestricted; unrestrictive; unscheduled; unstressed; unstructured; unsustainable

UNnoun [ U ]

us /ˈjuˈen/

abbreviation for United Nations (= an international organization that was established in 1945 to maintain world peace)

(Definition of “un-” from the Cambridge Academic Content Dictionary © Cambridge University Press)