Longman Dictionary of Contemporary English homepage

uncertainty

noun
     
un‧cer‧tain‧ty plural uncertainties
1 [uncountable] when you feel doubt about what will happen:
Times of great change are also times of uncertainty.
uncertainty about/as to
There is a great deal of uncertainty about the company's future.
2 [countable usually plural] a situation which you are not sure about because you do not know what will happen:
life's uncertainties
uncertainty of
the uncertainties of old age

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