/di fin"ee euhnz/ , n. , pl. definientia /di fin'ee en"sheuh, -shee euh/ .
1. something that defines, esp. the defining part of a dictionary entry.
2. Logic. an expression in terms of which another may be adequately defined. Cf. definiendum .
[ 1870-75; definiens, prp. of definire; see DEFINE ]