The term DICT. ABBR. is an abbreviation for dictionary, which is a book or collection of words and their definitions. The crossword solutions for this term are ANT (3 letters), ADJ (3 letters), and OBS (3 letters). ANT stands for antonym, which is a word that has the opposite meaning of another word. ADJ stands for adjective, which is a word used to describe a noun. OBS stands for obsolete, which is a word that is no longer in use.