Entry 4 senses · 2 variants Webster, 1913 Determinant /dĭt-ẽrm'-ən-ənt/ · De·ter·mi·nant · IPA /dɪˈtɜːmɪnənt/ a. n. 01 a. Serving to determine or limit; determinative. 1. Serving to determine or limit; determinative. 02 n. That which serves to determine; that which causes determination. 1. That which serves to determine; that which causes determination. 2. The sum of a series of products of several numbers, these products being formed according to certain specified laws(Math.) 3. A mark or attribute, attached to the subject or predicate, narrowing the extent of both, but rendering them more definite and precise.(Logic)