I. ˈ ̷ ̷ ̷ ̷| ̷ ̷ noun
Etymology: master (III) + mind
1. : a mind or person of masterly powers : a towering intellect
the mastermind of the thirteenth century — Agnes Repplier
2. : a person who supplies the directing or creative intelligence for a project or for a group of persons undertaking a project
mastermind of the world's first commercial jet airliner — Newsweek
II. ˈ ̷ ̷ ̷ ̷ˌ ̷ ̷ transitive verb
: to be the mastermind in or of : direct , supervise , engineer
masterminded … crimes such as warehouse burglaries — Alan Hynd
masterminding an insidious campaign to gain dominance over the world — L.M.Clucas