definiens

noun
de·​fin·​i·​ens | \di-ˈfi-nē-ˌenz \
plural definientia\ di-​ˌfi-​nē-​ˈen(t)-​shē-​ə \

Definition of definiens 

: an expression that defines : definition

First Known Use of definiens

1838, in the meaning defined above

History and Etymology for definiens

borrowed from Latin dēfīniens, from present participle of dēfīnīre "to mark the limits of, determine, define"

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The first known use of definiens was in 1838

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