"Der Händler definiert die Anzahl."

Translation: The dealer defines the quantity.

[rfo]

"definiert" sounds odd here. Besser wäre: "Der händler legt die Anzahl fest." In German "definieren" is used for the definition of meanings only (technical or legal terms, or relating to programming languages or math).

[jmooring]

So the same thing as in English. I love all the similarities with English. The small nuances were far more difficult when learning Spanish.

[BB__]

I wouldn't say that it's the same as English because "to define" can be used in other contexts. For example: "He didn't let the mistake define his career"

[SpotXSpot]

Why won't it accept "figure" for Anzahl?