Denoting quantum states or wave functions which change sign on inversion through the origin. The opposite of g.
[from German ungerade 'odd']
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(In units of measurement) micro- (10−6): direct read-out of concentration in ug or mg/l
[substituted for mu]
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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).