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Ones is the plural form of the numeral one. It can refer to multiple units that are each equal to one, as well as to the abstract number one in mathematics and logic. In computing and data processing, ones is used to describe data composed of the value 1, and is the name of common functions that generate arrays or matrices filled with 1s.

In mathematics, 1 is the multiplicative identity: multiplying by 1 leaves any number unchanged. The plural ones appears in contexts such as vectors of ones or matrices of ones, used in construction of constants, normalization, or broadcasting. In programming languages such as MATLAB and NumPy, a function or method called ones creates an array filled with the value 1.

In numeral systems, the ones place (the rightmost digit) represents the units. For example, in 5,308 the 8 is in the ones place, contributing eight units to the total.

Etymology: The word one comes from Old English ān, linked to related forms in other Germanic languages, with roots in the Proto-Germanic language.

Usage: Aside from mathematics and numeracy, ones appears in cultural and linguistic contexts as the plural form of one; it can appear in titles and names and in phrases like "ones and zeroes" to contrast binary digits in computing.