| Noun | 1. | guidepost - a rule or principle that provides guidance to appropriate behaviorrule, regulation - a principle or condition that customarily governs behavior; "it was his rule to take a walk before breakfast"; "short haircuts were the regulation" |
| 2. | guidepost - a post bearing a sign that gives directions or shows the waysign - a public display of a message; "he posted signs in all the shop windows" fingerboard, fingerpost - a guidepost resembling a hand with a pointing index finger |