An arithmetical value assigned to something or someone, esp. to indicate position in a series, or for purposes of reference, identification, etc.

Mathematics. The first or last term of a ratio, series, or set of numbers. †extremes conjunct and extremes disjunct, terms formerly in use in…

A numbered thing or article. Obsolete.

As ordinal: The ‘infiniteth’ member of a series. Obsolete. rare.

Number. Frequently with following numeral.

Used, like the other letters of the alphabet, to denote position in a series.

A function, set element, etc., that can be said to dominate, have precedence over, or constitute an upper bound for another mathematical entity of…

Mathematics. A number or vector used as an initial value in an algorithm, esp. for the purpose of generating a sequence of pseudorandom numbers.