- U1 [ju:](also u)noun (plural Us or U's)1》 the twenty-first letter of the alphabet.2》 denoting the next after T in a set of items, categories, etc.————————U2 [ju:]abbreviation1》 (in names of sports clubs) United.2》 Brit. universal (denoting films classified as suitable without restriction).3》 Uruguay (international vehicle registration).symbol the chemical element uranium.————————U3 [ju:]adjective Brit. informal (of language or social behaviour) characteristic of or appropriate to the upper social classes.Origin1954: abbrev. of upper class; coined by Alan S. C. Ross, professor of linguistics, and popularized by Nancy Mitford's Noblesse Oblige (1956).————————U4 [u:]noun a Burmese title of respect before a man's name, equivalent to Mr.
English new terms dictionary. 2014.