The Trésor de la langue française (French pronunciation: [tʁezɔʁ də la lɑ̃ɡ fʁɑ̃sɛːz]; TLF; "Treasury of the French Language"; subtitled Dictionnaire de la langue du XIXe et du XXe siècle (1789–1960)) is a 16-volume dictionary of 19th- and 20th-century French published by the Centre de Recherche pour un Trésor de la Langue Française from 1971 to 1994.
Its electronic edition, the Trésor de la langue française informatisé (TLFi), is available on CD-ROM and on the Web.
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