(botany) Inverted; having a position or mode of attachment the reverse of that which is usual.
(mathematics) Having the properties of an inverse; said with reference to any two operations, which, when both are performed in succession upon any quantity, reproduce that quantity.
(geometry) That has the property of being an inverse (the result of a circle inversion of a given point or geometrical figure); that is constructed by circle inversion.
(linguistics) A grammatical number marking that indicates the opposite grammatical number (or numbers) of the default number specification of noun class.