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explanandum

noun
ex·​pla·​nan·​dum | \ˌekspləˈnandəm\
plural explananda\ -​də \

Definition of explanandum 

: a word or an expression whose meaning is to be explained —used chiefly in philosophy —contrasted with explanans

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History and Etymology for explanandum

New Latin, from Latin, neuter of explanandus, gerundive of explanare to explain, make plain or clear

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