
die Trennung
separation
The ending of a romantic relationship or marriage.
Die Trennung von seiner langjährigen Freundin fiel ihm sehr schwer.
The separation from his long-term girlfriend was very hard for him.
separation
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separation
The ending of a romantic relationship or marriage.
Die Trennung von seiner langjährigen Freundin fiel ihm sehr schwer.
The separation from his long-term girlfriend was very hard for him.

separation
The process in which things or people are separated or divided from one another.
Die konsequente Trennung von Müll hilft beim Recycling.
Consistent separation of waste helps with recycling.

separation
The division or keeping apart of abstract areas or concepts, such as powers in a state.
In einer Demokratie ist die Trennung von Judikative und Exekutive ein wichtiges Prinzip.
In a democracy, the separation of the judiciary and the executive is an important principle.
'Die Trennung' (separation) is a noun derived from the verb 'trennen' (to separate). The ending '-ung' is often used to form a noun from a verb that describes the action or the result of that action.
Man muss den Müll sorgfältig trennen.
You have to separate the waste carefully.
'Die Trennung' is almost always used with the preposition 'von' and the dative to express what or who is being separated. This pattern applies to all meanings.
Die Trennung von ihrem Partner war schmerzhaft.
The separation from her partner was painful.
You can tell what kind of 'Trennung' is meant from the object after the preposition 'von'. If it refers to a person, it is about a relationship. If it refers to things, it is about separation. If it refers to concepts, it is about a basic distinction.
Die Trennung von den Kindern fiel ihr schwer.
The separation from the children was hard for her.
The word 'Trennung' is part of many important compound nouns. A very everyday example is 'die Mülltrennung' (waste separation), meaning the separation of waste.
In Deutschland ist die Mülltrennung gesetzlich vorgeschrieben.
In Germany, waste separation is required by law.
break / fracture / fraction
Trennung and Bruch can both refer to the end of a relationship. Trennung sounds neutral and initially describes the end of the relationship, while Bruch usually suggests an abrupt and conflict-ridden break. Use Trennung for a factual description and Bruch when the argument or the harsh break is important.

Nach vielen Gesprächen entschieden sie sich in gegenseitigem Einvernehmen für die Trennung.
After many discussions, they mutually agreed to end the relationship.
Nach dem heftigen Streit kam es zum Bruch zwischen den beiden Freunden.
After the heated argument, the two friends broke off their friendship.