Englishfor English speakers
certainty
Noun
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Certainty is the state of being 100% sure.
It's a little too early to say that with absolute certainty.
The doctor could not say what was wrong with any degree of certainty.
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If something is a certainty, it is sure to happen.
The expected change became a certainty two weeks ago.
We need to accept the certainties of aging, illness, and death.
equivalence
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noun
(= par)
a state of being essentially equal or equivalent; equally balanced
on a par with the best
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noun
essential equality and interchangeability
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noun
(= comparison, compare)
qualities that are comparable
no comparison between the two books
beyond compare
principle
Noun
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Principles are personal rules that tell you what is right and wrong.
It goes against my principles to ignore her.
One principle I follow is not to have regret.
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A principle is the general idea that explains or supports something.
The basic principle of his chair is that the knees should be below the hips.
Police must not accept money because it could affect their judgement. The same principle applies if gifts, etc, are offered.