to dress, array, or adorn, esp. for special occasions, ceremonials, etc.
–noun
2.
clothes or apparel, esp. rich or splendid garments.
3.
the horns of a deer.
Origin: 1250–1300; (v.) ME atiren < AF atirer, OF atirier, v. deriv. of a tire into a row or rank (see a-3, tier1); (n.) ME atir < AF, n. deriv. of the v.