mastermind(noun, verb) noun1. someone who creates new thingsSimilar word(s): conceiver, originatorDefinition categories: person, creator2. someone who has exceptional intellectual ability and originalitySimilar word(s): brain, brainiac, einstein, geniusDefinition categories: person, intellect, intellectual verb1. plan and direct (a complex undertaking)- he masterminded the robberySimilar word(s): direct, engineer, orchestrate, organise, organizeDefinition categories: cognition, plan