EX LIBRIS Meaning of EX LIBRIS in English [ ɛks'lɪbrɪs ]■ adverb used as an inscription on a bookplate to show the name of the book's owner.OriginL., lit. 'out of the books or library (of someone)'. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004