
die Regelung
regulation
A binding rule, provision, or agreement that organizes a particular matter or process.
Es gibt eine neue gesetzliche Regelung für die Arbeitszeiten.
There is a new legal regulation for working hours.
regulation / control
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regulation
A binding rule, provision, or agreement that organizes a particular matter or process.
Es gibt eine neue gesetzliche Regelung für die Arbeitszeiten.
There is a new legal regulation for working hours.

control / adjustment
The process of setting, adjusting, or controlling something in order to achieve or maintain a desired state, often in a technical context.
Die Regelung der Heizung funktioniert nicht richtig.
The control of the heating system is not working properly.
'Regelung' (regulation/control) is derived from the verb 'regeln' (to regulate/arrange). The ending '-ung' turns a verb into a feminine noun ('die Regelung') that describes the process or result of the action.
Wir müssen das Problem schnell regeln.
We need to sort out the problem quickly.
In the sense of a rule or provision, 'Regelung' (regulation) is often used in official contexts. Typical combinations are 'eine gesetzliche Regelung' (a legal regulation), 'eine Regelung treffen' (to make an arrangement), or 'eine klare Regelung finden' (to find a clear arrangement).
Die Partner haben eine faire Regelung für die Aufteilung der Kosten getroffen.
The partners made a fair arrangement for dividing the costs.
When it is about adjusting devices, you can recognize this meaning from the technical vocabulary. Common combinations are 'die Regelung der Temperatur' (temperature control), 'die Regelung der Geschwindigkeit' (speed control), or 'die elektronische Regelung' (electronic control).
Die stufenlose Regelung der Lautstärke ist sehr praktisch.
The stepless adjustment of the volume is very practical.
rule / period
Regel and Regelung can both refer to a binding requirement. A Regel usually states a specific instruction for behavior; a Regelung organizes a particular matter or process and can contain several individual rules.

Die Homeoffice-Regelung legt fest, an welchen Tagen die Beschäftigten zu Hause arbeiten dürfen.
The work-from-home regulation specifies on which days employees are allowed to work from home.
Für das Homeoffice gilt die Regel, dass sensible Akten im Büro bleiben.
The rule for working from home is that sensitive files must remain at the office.