/di fin'ee en"deuhm/ , n. , pl. definienda /-deuh/ .
1. something that is or is to be defined, esp. the term at the head of a dictionary entry.
2. Logic. an expression to be defined in terms of another expression previously defined. Cf. definiens .
[ 1870-75; definiendum, neut. ger. of definire; see DEFINE ]