involutory
/ˌɪnvəˈljuːtɔri/Definitions
1. adjective
Of, relating to, or characterized by an involute; or, of a transformation that is its own inverse.
“The mathematician’s research focused on involutory transformations in abstract algebra.”
2. adjective
A homomorphism from a group to itself, such that the image of every element of the group is equal to that element.
“The property of being involutory is a crucial aspect of studying group theory.”