antique (adj.) Look up antique at Dictionary.com
1530s, "aged, venerable;" 1540s, "having existed in ancient times," from Middle French antique "old" (14c.), from Latin antiquus (later anticus) "ancient, former, of olden times; old, long in existence, aged; venerable; old-fashioned," from PIE *anti- "before" (see ante-) + *okw- "appearance" (see eye (n.)).

Originally pronounced in English like its doublet antic, but French pronunciation and spelling were adopted in English from c. 1700. Meaning "not modern" is from 1640s. Related: Antiqueness.
antique (v.) Look up antique at Dictionary.com
"to give an antique appearance to," 1753 (implied in antiqued, in bookbinding, "finished in an antique style"), from antique (adj.). Related: Antiquing.
antique (n.) Look up antique at Dictionary.com
1520s, "a relic of antiquity," from antique (adj.). From 1771 as "an old and collectible thing."