das Zusammenspiel
interaction
The mutual effect and coordinated functioning of different elements, forces, or factors.
Das Zusammenspiel von Angebot und Nachfrage bestimmt den Preis.
The interaction of supply and demand determines the price.

interaction / interplay
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interaction
The mutual effect and coordinated functioning of different elements, forces, or factors.
Das Zusammenspiel von Angebot und Nachfrage bestimmt den Preis.
The interaction of supply and demand determines the price.

The word is a compound of 'zusammen' (together) and 'das Spiel' (game/play). It literally describes a 'game/play that takes place together' and thus means the interaction or coordination of different parts.
Das Zusammenspiel der verschiedenen Abteilungen muss verbessert werden.
The interaction between the different departments needs to be improved.
When referring to the effect of factors, the structure 'das Zusammenspiel von [etwas] und [etwas]' (the interaction of [something] and [something]) or 'das Zusammenspiel zwischen [etwas] und [etwas]' (the interaction between [something] and [something]) is often used.
Die Studie untersucht das Zusammenspiel zwischen Ernährung und Gesundheit.
The study examines the interaction between nutrition and health.
The meaning 'harmonische Zusammenarbeit' (harmonious cooperation) is usually found in contexts such as sports, music, or theater. Words like 'Mannschaft' (team), 'Orchester' (orchestra), or 'Schauspieler' (actors) point to this meaning.
Das Zusammenspiel der beiden Hauptdarsteller war absolut überzeugend.
The interplay between the two lead actors was absolutely convincing.
collaboration
'Zusammenarbeit' and 'Zusammenspiel' can both describe several people or parts functioning well together. 'Zusammenarbeit' is more direct and means working together on a task or goal. 'Zusammenspiel' puts more emphasis on how different people, forces, or parts affect one another and together produce a good result. In sports, music, or theater, 'Zusammenspiel' sounds especially natural because it is about harmony and coordination. Learners may confuse the words because good collaboration often also needs good interplay. As a guide: 'Zusammenarbeit' is more about the question 'Who works with whom?', while 'Zusammenspiel' is more about 'How does everything fit together?'.

Im letzten Spiel war das Zusammenspiel der Mannschaft deutlich besser als vorher.
In the last game, the team's interplay was clearly better than before.
Bei dem Schulprojekt war die Zusammenarbeit mit meiner Partnerin sehr angenehm.
In the school project, working with my partner was very pleasant.