Any convex body or surface.
A playing card made convex for use in cheating.
A small convex mirror used to cheat by observing other players' cards.
arranged such that for any two points in the set, a straight line between the two points is contained within the set.
Curved or bowed outward like the outside of a bowl, circle, or sphere.
having no internal angles greater than 180 degrees.
having an epigraph that is a convex set.
A collection of adjacent vacancies inside a crystal lattice.
An empty place; A location that has nothing useful.
An empty space; a vacuum.
A pocket of vapour inside a fluid flow, created by cavitation.
An extended region of space containing no galaxies.
An empty space between floors or walls, including false separations and planned gaps between a building and its facade.
A black cat.
To make invalid or worthless.
To throw or send out; to evacuate; to emit; to discharge.
To empty.
That does not return a value; a procedure.
Containing nothing; empty; not occupied or filled.
Having no incumbent; unoccupied; said of offices etc.
Being without; destitute; devoid.
Containing no immaterial quality; destitute of mind or soul.
Not producing any effect; ineffectual; vain.
Of no legal force or effect, incapable of confirmation or ratification.