Concave meaning

kŏn-kāv, kŏnkāv
Having a surface that is curved like the inside of a bowl.
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Curved like the inner surface of a sphere.
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The definition of concave is curving inward.

When a lens curves inward, it is an example of a concave lens.

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Curved like the inner surface of a sphere or bowl.
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(set theory, not comparable, of a set) Not convex; arranged such that there exist at least two points for which a straight line between these points does not lie wholly within the set.
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(functional analysis, not comparable, of a real-valued function on the reals) Having an epigraph which is a concave set.
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A concave surface or curve.
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The vault of the sky.
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One of the celestial spheres of the Ptolemaic or geocentric model of the world.

Aristotle makes [Fire] to move to the concave of the Moon. - Thomas Salusbury (1661).

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(manufacturing) An element of a curved grid used to separate desirable material from tailings or chaff in mining and harvesting.
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(surfing) An indentation running along the base of a surfboard, intended to increase lift.
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(skateboarding) An indented area on the top of a skateboard, providing a position for foot placement and increasing board strength.
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To render concave, or increase the degree of concavity.
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A concave surface, structure, or line.
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To make concave.
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A concave surface, object, etc.
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To make concave.
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Curved inward, like the inside of a circle or sphere.
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Origin of concave

  • Middle English from Latin concavus com- intensive pref. com– cavus hollow keuə- in Indo-European roots

    From American Heritage Dictionary of the English Language, 5th Edition

  • From Old French concave, from Latin concavus.

    From Wiktionary