stepparent — English Dictionary

Noun

1. One's parent's spouse who is not one's biological parent.

   Antonyms

   stepchild

   Examples

   More examples (1)

   The age at which a stepparent entered a child’s life, and whether they lived together and for how long, influences the quality of the relationship, studies show. […] As parents age, “there’s a lot of negotiation and uncertainties,” Dr. Silverstein said. “Who has the right to make decisions for stepparents becomes murky.”

Noun

1. the spouse of your parent by a subsequent marriage

   Broader terms

   parent