Meaning

verb make more attractive by adding ornament, colour, etc.

verb be beautiful to look at

verb furnish with power or authority; of kings or emperors

originFrom Middle English adornen, adournen, from Latin adōrnāre; from ad- + ōrnō (“furnish, embellish”). See adore, ornate. Replaced earlier Middle English aournen (“to adorn”) borrowed from Old French aorner, from the same Latin source.

Etymology from Wiktionary, CC BY-SA 3.0