Akademik

uncertainty
n. (pl. -ies)
1 the fact or condition of being uncertain.
2 an uncertain matter or circumstance.
Phrases and idioms:
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.

Useful english dictionary. 2012.