a/an (colloquial)
Umgangssprachliche Kurzform von 'eine' vor weiblichen Substantiven.
Colloquial contraction of the indefinite article 'eine' used before feminine nouns.
☞ Used strictly in spoken language or informal writing.
[Previous answer rejected: answer equals the source]
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Ich hab ’ne Idee.— I have an idea.
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Das ist ’ne gute Sache.— That is a good thing.