often "OR"
  • 1A Boolean operator that gives the value one if at least one operand (or input) has a value of one, and otherwise has a value of zero.

    1. 1.1Electronics A circuit that gives an output signal if there is a signal on any of its inputs.


Where a verb follows a list separated by or, the traditional rule is that the verb should be singular, as long as the things in the list are individually singular, as in a sandwich or other snack is included in the price (rather than a sandwich or other snack are included in the price). The argument is that each of the elements agrees separately with the verb. The opposite rule applies when the elements are joined by and—here the verb should be plural: a sandwich and a cup of coffee are included in the price. These traditional rules are observed in good English writing style but are often disregarded in speech. On the use of either … or, see either

Definition of or in English:



  • Gold or yellow, as a heraldic tincture.

    postpositive ‘a bend or’


Early 16th century: from French, from Latin aurum ‘gold’.