Definition of "u"

u¹

/ˈjuː/

letter
lower case, upper case U, plural us or u's
1. The twenty-first letter of the English alphabet, called u and written in the Latin script.
noun
plural ues
1. The name of the Latin-script letter U/u.
2. A thing in the shape of the letter U

u²

pronoun
second person, singular or plural, nominative or objective, possessive determiner ur, possessive pronoun urs, singular reflexive urself, plural reflexive urselves
1. (Internet slang, text messaging, colloquial) Abbreviation of you.
adjective
1. Abbreviation of underwater.