concavo-concave, adj., concavo-concave.
concavo-convexe, adj., concavo-convex.
concédant, n.m., grantor.
concéder, v.a., to grant, to yield, to allow.
se concéder, v.r., to be granted, allowed.
concentration, n.f., concentration.
concentré, -e, part., concentrated; concentred; close, silent, reserved, close-tongued. Un homme toujours —; a thoughtful man; a man who is not communicative. Haine —e; suppressed hatred.
concentrer, v.a., to concentrate; to dissemble, to repress, to smother. — sa fureur; to dissemble one’s rage.
se concentrer, v.r., to concentrate, to meet in one centre; to centre; to retire within one’s self.