in·verse
(ˌ)in-ˈvərs

ˈin-ˌvərs

1

**:**opposite in order, nature, or effect

2

**:**being an inverse function

inverse sine

2

**:**a proposition or theorem formed by contradicting both the subject and predicate or both the hypothesis and conclusion of a given proposition or theorem

the inverse of "if A then B" is "if not-A then not-B"

compare contrapositive
3

a

**:**inverse function

also

**:**an operation (such as subtraction) that undoes the effect of another operation
b

**:**a set element that is related to another element in such a way that the result of applying a given binary operation to them is an identity element of the set

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Merriam-Webster unabridged
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