Entry 2 senses · 2 variants Webster, 1913 Aurelian · Au·re·li·an · IPA a. n. 01 a. Of or pertaining to the aurelia. 1. Of or pertaining to the aurelia. 02 n. An amateur collector and breeder of insects, esp. of butterflies and moths; a lepidopterist. 1. An amateur collector and breeder of insects, esp. of butterflies and moths; a lepidopterist.