Entry 1 sense Webster, 1913 Robinia /rōb-ēn'-ē-ə/ · Ro·bin·i·a · IPA /roʊbˈiːniːə/ 01 n. A genus of leguminous trees including the common locust of North America (Robinia Pseudocacia). 1. A genus of leguminous trees including the common locust of North America (Robinia Pseudocacia).(Bot.)