Entry 1 sense Webster, 1913 Overlying /ōvˌ-ẽrl-ī'-ĭng/ · O·ver·ly·ing · IPA /ˌoʊvərlˈaɪɪŋ/ 01 a. Lying over or upon something; as, overlying rocks. 1. Lying over or upon something; as, overlying rocks.