Something that's antiquarian is antique, and usually collectible. Antiquarian2020欧洲杯时间 books are used books that have some value because they're rare.
If you go into the antiquarian business, you'll probably buy and sell old things — antique furniture, paintings, or coins, for example. An antiquarian book store has unusual and valuable editions of books for sale. An antiquarian is someone who specializes in, studies, or collects antiques. The word comes from the Latin antiquarius2020欧洲杯时间, "pertaining to antiquity."