- something that defines, especially the defining part of a dictionary entry.
- Logic. an expression in terms of which another may be adequately defined.
Origin of definiens
1870–75; < Latin dēfīniēns, present participle of dēfīnīre; see define
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- the word or words used to define or give an account of the meaning of another word, as in a dictionary entryCompare definiendum
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012