Entry 2 senses · 2 variants Webster, 1913 cross-index · IPA n. v. t. 01 n. a reference at one place in a work to information at another place in the same work. 1. a reference at one place in a work to information at another place in the same work. Syn. cross-reference. 02 v. t. to provide cross-references in (a book or other document). 1. to provide cross-references in (a book or other document). Syn. cross-reference.