Noun

The state of being certain.

* Fisher Ames

The certainty of punishment is the truest security against crimes.

An instance of being certain.

A fact or truth unquestionably established.

* November 2 2014 , Daniel Taylor, " Sergio Agüero strike wins derby for Manchester City against 10-man United," guardian.co.uk

Yet the truth is that City would probably have been coasting by that point if the referee, Michael Oliver, had not turned down three separate penalties, at least two of which could be accurately described as certainties .

* 1824 , (Walter Savage Landor), Imaginary Conversations Volume 1

Certainties are uninteresting and sating.

Noun

(en noun)

Mental acceptance of a claim as likely true.

*{{quote-magazine, date=2013-12-06, author=(George Monbiot)

, volume=189, issue=26, page=48, magazine=(The Guardian Weekly) , title= Why I'm eating my words on veganism – again , passage=The belief that there is no conflict between [livestock] farming and arable production also seems to be unfounded: by preventing the growth of trees and other deep vegetation in the hills and by compacting the soil, grazing animals cause a cycle of flash floods and drought, sporadically drowning good land downstream and reducing the supply of irrigation water.}}

Faith or trust in the reality of something; often based upon one's own reasoning, trust in a claim, desire of actuality, and/or evidence considered.

(countable) Something believed.

(uncountable) The quality or state of believing.

(uncountable) Religious faith.

(in the plural) One's religious or moral convictions.