definiendum

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de·fin·i·en·dum

D0094200 (dĭ-fĭn′ē-ĕn′dəm)n. pl. de·fin·i·en·da (-də) A word or expression that is being defined.
[Latin dēfīniendum, neuter gerundive of dēfīnīre, to define; see define.]

definiendum

(dɪˌfɪnɪˈɛndəm) n, pl -da (-də) (Linguistics) something to be defined, esp the term or phrase to be accounted for in a dictionary entry. Compare definiens[Latin]

de•fin•i•en•dum

(dɪˌfɪn iˈɛn dəm)

n., pl. -da (-də). a term that is or is to be defined. [1870–75; < Latin dēfīniendum, neuter ger. of dēfīnīre]

definiendum

1. an expression that has to be defined in terms of a previously defined expression.
2. anything that has to be defined. — definienda, n., pl.See also: Logic