(optics) A dimensionless quantity (denoted F), such that for an electromagnetic wave passing through an aperture and hitting a screen, F=(a²)/(L𝜆) where a is the characteristic size (e.g. radius) of the aperture, L is the distance of the screen from the aperture, and 𝜆 is the incident wavelength.

(mathematics, number theory) The field of study dealing with computational methods for investigating and solving problems in number theory and arithmetic geometry.

Of or relating to the ancient Celtiberian city of Numantia.

Synonym of computational number theory.

Synonym of mesh number

plural of sieve number

(Jamaica, slang) To engage in anal sex; to bugger; to sodomize.

plural of fax number

plural of cushy number

plural of preferred number