Summary

In Koiné Greek, the number ending of a word indicates the number of things being referred to by that word.

Article

Koiné Greek uses various kinds of word endings. The term "number" refers to one of these varieties of word endings. Number endings in Koiné Greek indicate how many there are of that particular thing. Nouns, adjectives, pronouns, participles, verbs, and definite articles all require a number ending. Adverbs do not require a case ending.

There are two different kinds of number endings: singular and plural.

The singular ending indicates that there is only one.

The plural ending indicates that there is more than one.

Number is the grammatical feature which signifies whether one (singular) or more (plural) participants are indicated by a word.

Article

1. If a word's grammatical number is singular, it denotes one participant.
2. If a word's grammatical number is plural, it denotes more than one participant.
3. A collective noun has the grammatical feature of singular yet refers to a group.
4. The grammatical number of a verb usually agrees with the number of it's subject.