Entry 1 sense Webster, 1913 Overvaluation /ōvˌ-ẽrv-ălˌ-yo͞o-āsh'-ən/ · O·ver·val·u·a·tion · IPA /ˌoʊvərvˌæljuːˈeɪʃən/ 01 n. Excessive valuation; overestimate. 1. Excessive valuation; overestimate.