Usage notes

* Many languages have singular and plural forms for one item or more than one item. Some have a singular form for one, dual form for two, trial form for three, paucal form for several, and plural for more than two (e.g., Arabic, Fijian). * While the plural form generally refers to two or more persons or things, that is not always the case. The plural form is often used for zero persons or things, for fractional things in a quantity greater than one, and for people or things when the quantity is unknown. * In English, the plural is most often formed simply by adding the letter "s" to the end of a noun, e.g. apple/apples. There are many exceptions, however, such as echo/echoes, mouse/mice, child/children, deer/deer (same word), etc.