
die Entscheidung
decision
The choice between several possibilities or alternatives that leads to a result or action.
Die Entscheidung, den Job zu wechseln, ist mir nicht leichtgefallen.
The decision to change jobs was not easy for me.
decision
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decision
The choice between several possibilities or alternatives that leads to a result or action.
Die Entscheidung, den Job zu wechseln, ist mir nicht leichtgefallen.
The decision to change jobs was not easy for me.

deciding moment
The final result or outcome of a competition, fight, or game.
Im Finale fiel die Entscheidung erst in der Verlängerung.
In the final, the deciding moment came only in extra time.

ruling
A formal decision or judgment made by an official body such as a court or authority.
Das Gericht wird seine Entscheidung morgen verkünden.
The court will announce its ruling tomorrow.
'Entscheidung' is derived from the verb 'entscheiden' (to decide). The ending '-ung' is a typical way of forming nouns from verbs in German. These nouns are always feminine ('die').
Ich muss mich schnell entscheiden.
I have to decide quickly.
The most important and most common verb combination is 'eine Entscheidung treffen' (to make a decision). Learners often incorrectly use '*eine Entscheidung machen'.
Wir müssen bald eine Entscheidung über den Urlaubsort treffen.
We have to make a decision about the vacation destination soon.
To express what someone decides for or against, the prepositions 'für' (for) or 'gegen' (against) + accusative are used.
Die Entscheidung für diesen Studiengang war richtig.
The decision in favor of this degree program was the right one.
In the context of sports or competitions, the verb 'fallen' (to fall) is often used to describe the moment of the result. So the decision 'fällt' (falls/is decided).
Beim Elfmeterschießen fiel die Entscheidung erst mit dem letzten Schuss.
In the penalty shootout, the decision came only with the final shot.
choice / election
Wahl and Entscheidung both refer to settling on one option among several possibilities. Wahl focuses more on the available alternatives and the possibility of choosing; Entscheidung places more emphasis on the binding decision or its result. Use Wahl when weighing the options and Entscheidung after making the choice.

Nach langem Überlegen traf ich die Entscheidung für das günstigste Angebot.
After thinking it over for a long time, I decided on the cheapest offer.
Bei den drei Angeboten hatte ich die Wahl zwischen verschiedenen Preisen.
With the three offers, I had a choice between different prices.