die Million
million
The number 1,000,000, that is, one thousand times one thousand.
Die Stadt hat mehr als eine Million Einwohner.
The city has more than one million inhabitants.

million
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million
The number 1,000,000, that is, one thousand times one thousand.
Die Stadt hat mehr als eine Million Einwohner.
The city has more than one million inhabitants.

Unlike smaller numbers such as 'hundert' (hundred) or 'tausend' (thousand), 'Million' is a feminine noun. It is always capitalized and has a plural ('Millionen').
Eine Million ist eine sehr große Zahl.
One million is a very large number.
When 'Million' is used with a noun, the noun follows directly afterward in the plural. The form 'Million' is used with 'eine' (one); otherwise, use 'Millionen' (millions).
Das Haus kostet eine Million Euro.
The house costs one million euros.
The plural 'Millionen' (millions) is often used without an exact number to express a very large, unspecified amount. Sometimes it is combined with 'von' + noun.
Der Popstar hat Millionen von Fans auf der ganzen Welt.
The pop star has millions of fans all over the world.
billion
'die Million' and 'die Milliarde' are both large numbers and are often used for money, population figures, or costs. The difference is very large: one million is 1,000,000, while eine Milliarde is 1,000,000,000. So eine Milliarde is one thousand million. Learners may confuse the words because they sound similar and both begin with 'Milli-'. With numbers, however, the distinction is important because the amount changes greatly.

Die kleine Stadt hat fast eine Million Einwohner.
The small city has almost one million inhabitants.
Der neue Bahnhof kostet mehr als eine Milliarde Euro.
The new train station costs more than one billion euros.