Meaning of UNCERTAINTY in English
n. (pl. -ies) 1 the fact or condition of being uncertain. 2 an uncertain matter or circumstance. uncertainty principle (in full Heisenberg uncertainty principle after W. Heisenberg, Ger. physicist d. 1976) Physics the principle that the momentum and position of a particle cannot both be precisely determined at the same time.
Concise Oxford English dictionary. Краткий оксфордский словарь английского языка. 2012