fledged \fledged\ adj. 1. having developed feathers or plumage; often used in combination; -- of birds. [Narrower terms: {fledgling(prenominal), fledgeling(prenominal)}] {unfledged} Syn: mature. [WordNet 1.5] 2. equipped with feathers; -- of an arrow. Syn: vaned. [WordNet 1.5]