From Middle English uncerteynte; equivalent to un- + certainty or uncertain + -ty.

• (British) IPA: /ʌnˈsɜːtənti/
• (America) IPA: /ʌnˈsɝtənti/

uncertainty

1. (uncountable) Doubt; the condition of being uncertain or without conviction.
   • 1897 December (indicated as 1898), Winston Churchill, chapter IV, in The Celebrity: An Episode, New York, N.Y.: The Macmillan Company; London: Macmillan & Co., Ltd., →OCLC ↗, page 51 ↗:

     “Well,” I answered, at first with uncertainty, then with inspiration, “he would do splendidly to lead your cotillon, if you think of having one.” ¶ “So you do not dance, Mr. Crocker?” ¶ I was somewhat set back by her perspicuity.

2. (countable) Something uncertain or ambiguous.
3. (uncountable, mathematics) A parameter that measures the dispersion of a range of measured values.

• uncertainness

• certainty

• French: incertitude
• German: Unsicherheit, Ungewissheit
• Italian: incertezza
• Portuguese: incerteza
• Russian: неуве́ренность
• Spanish: incertidumbre, incerteza

• German: Unsicherheit
• Portuguese: incerteza
• Russian: неуве́ренность

• Russian: погре́шность