plural of ex-lap

(mathematics) Formally, given two partially ordered sets A and B, the order ≤ on the Cartesian product A × B such that (a,b) ≤ (a′,b′) if and only if a < a′ or (a = a′ and b ≤ b′).

(biology) A scientist who specializes in ciliatology.

(transitive) To invoke or impose a dress code upon (someone); to take disciplinary action on (someone) for violating a dress code.