definiendum

[ dih-fin-ee-en-duhm ]
/ dɪˌfɪn iˈɛn dəm /

noun, plural de·fin·i·en·da [dih-fin-ee-en-duh]. /dɪˌfɪn iˈɛn də/.

something that is or is to be defined, especially the term at the head of a dictionary entry.
Logic. an expression to be defined in terms of another expression previously defined.

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Origin of definiendum

First recorded in 1870–75; from Latin dēfīniendum, neuter gerundive of dēfīnīre “to limit, define”; see define
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for definiendum

definiendum
/ (dɪˌfɪnɪˈɛndəm) /

noun plural -da (-də)

something to be defined, esp the term or phrase to be accounted for in a dictionary entryCompare definiens

Word Origin for definiendum

Latin
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