Entry 1 sense Webster, 1913 Mausoleum /mô'sə-lē'əm/ · Mau·so·le·um · IPA /ˌmɔ.səˈli.əm/ 01 n. A magnificent tomb, or stately sepulchral monument. pl. Mausoleums, -lea ((#)) 1. A magnificent tomb, or stately sepulchral monument.