Entry 1 sense Webster, 1913 Megalesian · Meg·a·le·sian · IPA /ˌmɛɡəˈliːʒən/ 01 a. Pertaining to, or in honor of, Cybele; as, the Megalesian games at Rome. 1. Pertaining to, or in honor of, Cybele; as, the Megalesian games at Rome.