der Turnus
cycle / rotation
A regularly recurring period of time or a fixed order in which something happens or tasks rotate.
Die Abteilungsleitung wechselt in einem zweijährigen Turnus.
The department leadership changes on a two-year rotation.

cycle / rotation
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cycle / rotation
A regularly recurring period of time or a fixed order in which something happens or tasks rotate.
Die Abteilungsleitung wechselt in einem zweijährigen Turnus.
The department leadership changes on a two-year rotation.

In the meaning 'Zeitraum' (period of time), 'Turnus' (cycle/rotation) is almost always used with the preposition 'in' and an adjective or a time expression. Typical patterns are 'in einem jährlichen Turnus' (on an annual cycle) or 'im Turnus von zwei Jahren' (at two-year intervals).
Die Wartung der Geräte erfolgt in einem festen Turnus.
Maintenance of the devices is carried out on a fixed schedule.
The word 'Turnus' (cycle/rotation) belongs more to formal or administrative language. It is often used in organizations, clubs, or professional contexts to describe regular processes.
Der Vorstand wird in einem zweijährigen Turnus neu gewählt.
The board is newly elected on a two-year cycle.
The meaning 'praktische Ausbildung für Ärzte' (practical training for doctors) is specific to Austria. In Germany, people instead speak of the 'Praktisches Jahr (PJ)' (practical year) or the 'Weiterbildung zum Facharzt' (specialist training).
In Österreich muss jeder Arzt nach dem Studium einen Turnus machen.
In Austria, every doctor has to do a medical internship after completing their studies.
When the word 'Turnus' (medical internship) is used in connection with medicine, doctors, or hospitals in Austria, it always refers to practical training and not to a time interval.
Sie arbeitet als Turnusärztin auf der Chirurgie.
She works as a medical intern in surgery.
order / sequence
'Reihenfolge' and 'Turnus' both have to do with order. 'Reihenfolge' says what comes first, next, and last. This can be a one-time order, for example in a list or in work steps. 'Turnus' is used more when something recurs regularly or when tasks rotate according to a fixed plan. Learners may confuse the words because a 'Turnus' can also include an order or sequence. In practice: for a one-time order, 'Reihenfolge' fits better; for regular repetition, 'Turnus' fits better.

Im Büro wechselt der Telefondienst jede Woche nach einem festen Turnus.
At the office, phone duty rotates every week according to a fixed schedule.
In der Küche erklärt Lisa die Reihenfolge der Schritte für das Rezept.
In the kitchen, Lisa explains the order of the steps for the recipe.