BRAIN

n. 1 brains, intelligence, intellect, understanding, sense, thought, imagination, capacity, perspicacity, perceptiveness, perception, percipience; wisdom, sagacity, wit, discernment, acumen; knowledge, cognition Although she's not yet ten, she has the brain to become a great mathematician 2 genius, mastermind, intellectual; leader, planner Many people regard Einstein as the greatest brain of the 20th century Ivor was clearly the brains of the operation.