article
a, an
A1
Means 'a' or 'an'. It is the indefinite article used for masculine and neuter nominative singular and for neuter accusative; masculine accusative becomes 'einen'. Declensions include dative 'einem' and genitive 'eines'. There is no indefinite plural. Used before singular count nouns and with adjective endings.
Examples
Der Manager versprach, dass er ein Treffen organisieren würde, obwohl die Zeit knapp war.
The manager promised that he would organize a meeting, although time was tight.
Gib mir ein Glas Wasser, bitte.
Give me a glass of water, please.
Ich habe ein Buch.
I have a book.
Details
Mnemonics
Picture a single item with a tag 'ein' meaning one (a/an)
sounds like English 'ine' — think 'ein' = a/an (masculine or neuter)
Notes
Indefinite article; plural forms are not applicable.