early 15c., from Old French concave (14c.) or directly from Latin concavus "hollow, arched, vaulted, curved," from com-, intensive prefix (see com-), + cavus "hollow" (see cave (n. [..]

concave means curved inwards, it is the opposite to convex. • a concave polygon has one or more angles larger than 180º. EXAMPLES:

curving inward.

A curve that is 'bowed-in' toward the origin, like entering a cave. Technically speaking, the slope of a concave curve decreases from left to right as the X-axis variable increases.

1. Said of a curve that bulges away from some reference point, usually the horizontal axis or the origin of a diagram. More formally, a curve is concave from below (or concave to something below it) i [..]

Projecting inwards, the area within a curve

A curved surface on which the center is deeper than the edges, such as the inside of a bowl.

 hollow.

Curved inwards (as opposed to convex), as in certain mirrors.

a figure is concave if a line segment can be drawn so that it goes in, out, then back into the figure. concave up:

Surface with center of curvature on the same side as the observer.

(adj) curving inward

A surface curved like the interior of a circle or sphere.

Having a rounded, somewhat depressed surface like the hollowed, inner surface of a piece of a sphere.

Hollowed or rounded inward like the inside of a bowl.

A concave optical lens has an inward curving surface, causing incoming light to diverge.

A coastline that curves inwards.

Used to describe the surface area of an attacking army. Pre-engagement, generally it is recommended to spread your army before attacking to ensure optimal damage output and prevent units cluttering am [..]

hollowed out; a depression

Concave is described as inwardly curved. Historically, gemstones were faceted with flat surfaces applied at various angles. However, recent advances in technology made possible the development of machinery that could produce curved surfaces on gems. This style of fashioning is called concave cutting. Concave is the opposite of convex.

A concave line or surface.

Curving inwardly.

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.. (functional analysis,not compar [..]

See the discussion of negative convexity.

Concave or concavity may refer to: