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."
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" (from PIE root *okw- "to see").

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.