re·joice / riˈjois/ • v. [intr.] feel or show great joy or delight: he rejoiced when he saw his friend alive he rejoiced in her spontaneity and directness | [as n.] (rejoicing) an occasion for rejoicing. ∎ [tr.] archaic cause joy to: I love to rejoice their poor Hearts at this season.DERIVATIVES: re·joic·er n.re·joic·ing·ly adv.