Denoting quantum states or wave functions which change sign on inversion through the origin.The opposite of g
From German ungerade ‘odd’.
(in units of measurement) micro- (10⁻⁶)
- ‘direct read-out of concentration in ug or mg/l’
Substituted for mu.
nounplural noun Us, plural noun U's
1The twenty-first letter of the alphabet.not in service, unavailable for use, not in use, out of action, unserviceable
- 1.1Denoting the next after T in a set of items, categories, etc.
2UA shape like that of a capital U, especially a cross section.
- ‘U-shaped glaciated valleys’
1(in names of sports clubs) United.
- ‘Oxford U’
2British Universal (denoting films classified as suitable without restriction).
3Uruguay (international vehicle registration).
4(also u)informal You.
- ‘what will u do next?’
The chemical element uranium.
(of language or social behaviour) characteristic of or appropriate to the upper social classes.
upper-class, aristocratic, upmarket, Home Counties
- ‘U manners’
1950s abbreviation of upper class; coined in 1954 by Alan S. C. Ross, professor of linguistics, the term was popularized by its use in Nancy Mitford's Noblesse Oblige (1956).
A Burmese title of respect before a man's name, equivalent to Mr.
- ‘U Thien San’