step-parent(redirected from a step-parent)
A caregiver of a child who assumed the parental role through marriage to one of the child's original (usually biological) parents. Most commonly, a step-parent is the second spouse of one of the child's biological parents. Through my marriage to Kent, I became a step-parent to his three beautiful daughters.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.