Úsáidtear an uimhir iolra chun tagairt do níos mó ná rud amháin. Fir an uimhir iolra atá ag an ainmfhocal fear, mar shampla. Bíonn aidiacht san uimhir iolra nuair a leanann sé ainmfhocal atá san iolra. (The plural is used to refer to more than one thing. Fir is the plural of the noun fear, for example. An adjective is in the plural when it follows a noun that is in the plural.)