definiens

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de·fin·i·ens

D0094300 (dĭ-fĭn′ē-ĕnz′)n. pl. de·fin·i·en·ti·a (-ĕn′shē-ə, -shə) The word or words serving to define another word or expression, as in a dictionary entry.
[Latin dēfīniēns, present participle of dēfīnīre, to define; see define.]

definiens

(dɪˈfɪnɪənz) n, pl definientia (dɪˌfɪnɪˈɛnʃə) (Linguistics) the word or words used to define or give an account of the meaning of another word, as in a dictionary entry. Compare definiendum[Latin: defining]

de•fin•i•ens

(dɪˈfɪn i ənz)

n., pl. de•fin•i•en•tia (dɪˌfɪn iˈɛn ʃə, -ʃi ə) an expression that serves as a definition. Compare definiendum. [1870–75; < Latin dēfīniēns, present participle of dēfīnīre; see define]