present participle of concern

That which one is concerned in; one's business.

(transitive) To develop an idea; to form in the mind; to plan; to devise; to originate. / (transitive) To understand (someone). / (intransitive or transitive) To become pregnant (with).

(geometry) Having a common center.

curved like the inner surface of a sphere or bowl / (geometry, not comparable, of a polygon) not convex; having at least one internal angle greater than 180 degrees.

A concave surface or curve. / The vault of the sky. / One of the celestial spheres of the Ptolemaic or geocentric model of the world.

To render concave, or increase the degree of concavity.

(music) A piece of music for one or more solo instruments and orchestra.

The end, finish, close or last part of something. / The outcome or result of a process or act. / A decision reached after careful thought.

The practice of keeping secrets. / The condition of being hidden or concealed. / (military) protection from observation or surveillance.