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c.1300, from Old French geant, earlier jaiant (12c.), from Vulgar Latin *gagantem (nominative gagas), from Latin gigas "giant," from Greek gigas (genitive gigantos), one of a race of savage beings, sons of Gaia and Uranus, eventually destroyed by the gods, probably from a pre-Greek language. Replaced Old English ent, eoten, also gigant. The Greek word was used in Septuagint to refer to men of great size and strength, hence the expanded use in modern languages. Of very tall persons from 1550s; of persons who have any quality in extraordinary degree, from 1530s.
In þat tyme wer here non hauntes Of no men bot of geauntes. [Wace's Chronicle, c.1330]