Entry 1 sense Webster, 1913 Guidepost /gīd'-pōstˌ/ · Guide·post · IPA /ˈɡaɪdˌpoʊst/ 01 n. A post at the fork of a road, with a guideboard on it, to direct travelers. 1. A post at the fork of a road, with a guideboard on it, to direct travelers.