From English 'antique'. Refers to valuable old objects such as furniture or crafts from earlier periods. Also used adjectivally for 'antique-style' items.
母はアンティークの食器を集めるのが趣味だ。
My mother collects antique tableware as a hobby.
あの店にはアンティーク家具がたくさん並んでいる。
That shop has a lot of antique furniture on display.
アンティーク調のランプを部屋に置いたら雰囲気が出た。
Putting an antique-style lamp in the room gave it a nice atmosphere.