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umlaut a change in the sound of a vowel due to influence by a following vowel or semivowel, or the vowel so changed. [3 definitions]
ump (informal) umpire.
umpire one appointed to rule on plays in a game, esp. a professional performing that function in a baseball game; referee. [4 definitions]
umpteen (informal) many, or seemingly uncountable.
UN (used with a sing. or pl. verb) abbreviation of "United Nations," (used with a sing. or pl. verb) an international organization founded in 1945 to promote world peace, security, cooperation, and understanding.
un- not. [2 definitions]
unabashed not feeling or showing embarrassment, uneasiness, or shame.
unabbreviated combined form of abbreviated.
unable lacking the necessary power, skill, or means; not able; incapable.
unabraded combined form of abraded.
unabridged not condensed or shortened; complete. [2 definitions]
unabsorbed combined form of absorbed.
unabsorbent combined form of absorbent.
unacademic combined form of academic.
unacademically combined form of academically.
unaccented combined form of accented.
unacceptable combined form of acceptable.
unaccepted combined form of accepted.
unacclimated combined form of acclimated.
unacclimatized combined form of acclimatized.
unaccommodated combined form of accommodated.