definiendum

noun
de·​fin·​i·​en·​dum | \ di-ˌfi-nē-ˈen-dəm How to pronounce definiendum (audio) \
plural definienda\ di-​ˌfi-​nē-​ˈen-​də How to pronounce definienda (audio) \

Definition of definiendum

: an expression that is being defined

First Known Use of definiendum

1871, in the meaning defined above

History and Etymology for definiendum

borrowed from Latin dēfīniendum "something to be defined," from neuter gerundive of dēfīnīre "to mark the limits of, determine, define"

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