
neunzig
ninety
The cardinal number 90, which comes between eighty-nine and ninety-one.
Der Zug fährt mit einer Geschwindigkeit von neunzig Kilometern pro Stunde.
The train is traveling at a speed of ninety kilometers per hour.
ninety
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ninety
The cardinal number 90, which comes between eighty-nine and ninety-one.
Der Zug fährt mit einer Geschwindigkeit von neunzig Kilometern pro Stunde.
The train is traveling at a speed of ninety kilometers per hour.
The ending '-zig' is used in German to form the tens numbers from 20 to 90. 'Neunzig' (ninety) follows this pattern and means 'nine times ten'.
Meine Großmutter wird bald neunzig Jahre alt.
My grandmother will soon be ninety years old.
To describe someone's decade of life, you say 'in den Neunzigern sein' (to be in one's nineties). To refer to the decade from 1990 to 1999, people say 'die Neunziger' (the nineties) or 'die neunziger Jahre' (the nineties).
Mein Großvater ist schon in den Neunzigern.
My grandfather is already in his nineties.
Although 'neunzig' (ninety) is a number, it can be used like a noun for a bus route, a room number, or a jersey number. In this case, it is capitalized.
Die Buslinie Neunzig fährt direkt zum Bahnhof.
Bus route Ninety goes directly to the train station.
nineteen
“Neunzig” refers to the number 90, while “neunzehn” refers to the number 19. The similar-sounding endings therefore stand for clearly different numbers: “neunzig” is used for 90, and “neunzehn” for 19.

Für das Konzert stehen neunzig Stühle im Saal.
There are ninety chairs in the hall for the concert.
Für die kleine Feier stehen neunzehn Stühle im Saal.
There are nineteen chairs in the hall for the small celebration.