Plural is a grammatical number, typically referring to more than one of the referent in the real world.

In the English language, singular and plural are the only grammatical numbers.

In English, nouns, pronouns, and demonstratives inflect for plurality. (See English plural.) In many other languages, for example German, Romance languages, and Esperanto, articless and adjectives also inflect for plurality. For example, in the English sentence "the brown cats run," only the noun and verb are inflected; but in the French sentence "les chats bruns courent," every word (article, noun, adjective, and verb) is inflected.

In some languages including Biblical Hebrew and Inuktitut there is also a dual number (two objects). Some other grammatical numbers present in various languages include nullar (no objects), trial (three objects) and paucal (a few objects). In languages with dual, trial, or paucal numbers, plural refers to numbers higher than those (i.e. more than two, more than three, or many.)

However, numbers besides singular, plural, and to a lesser extent dual, are extremely rare. Furthermore, many languages (such as all members of the CJK group) lack any significant grammatical number at all. Japanese has plural forms only on some pronouns.