A child's natural parent, either the male who supplied the sperm or the female who supplied the egg which interacted for the child's conception.

(slang) A person who spends money for the benefit of a younger person, typically in exchange for companionship and/or sexual favors.

plural of parent company

(business) A company that owns or controls one or more other companies.

plural of parent compound

An adult who cares for a child who has been placed in foster care.

One's spouse's parent.

Alternative form of grandparent

(physics) the nuclide whose radioactive decay product is a specific daughter nuclide

The parent (either of a separated pair) with whom a child or children do not live the majority of the time.