What is the meaning of Thesaurus?

A publication that provides synonyms (and sometimes antonyms and other semantic relations) for the words of a given language.

A dictionary or encyclopedia.

A hierarchy of subject headings: canonical titles of themes and topics, the titles serving as search keys.

treasure, hoard

a dear friend, loved one

a vault for treasure

chest, strongbox

repository, collection

alternative form of tesauro

Source: wiktionary.org