The mother who provided the egg from which an embryo developed and, therefore, contributed to the genetic makeup of the ensuing child. gentlemen's agreement n. Colloquial. An unwritten agreement, not enforceable by law but backed by the parties' good faith. adj. germane Pertaining to the subject matter at hand. v. gerrymandering Apportioning legislative districts in a way calculated to give an undue advantage to a political gift party, by concentrating its members or separating those of anoth...