zunächst
first
Indicates the first step in a sequence of actions; first, at the beginning.
Zunächst müssen wir die Fakten prüfen, bevor wir eine Entscheidung treffen.
First, we need to check the facts before we make a decision.

first / for now
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first
Indicates the first step in a sequence of actions; first, at the beginning.
Zunächst müssen wir die Fakten prüfen, bevor wir eine Entscheidung treffen.
First, we need to check the facts before we make a decision.

When 'zunächst' (first/for now) stands at the beginning of a main clause (position 1), the conjugated verb follows directly after it in position 2. The subject then moves after the verb.
Zunächst möchte ich alle herzlich begrüßen.
First, I would like to warmly welcome everyone.
The meaning 'zuerst' (first) often introduces a sequence followed by further steps (e.g. with 'dann' (then) or 'danach' (after that)). The meaning 'vorläufig' (for now/provisionally) indicates a temporary solution that should later be followed by a final one.
Zunächst kochen wir den Reis, dann bereiten wir das Gemüse vor.
First, we cook the rice; then we prepare the vegetables.
'Zunächst' (first/for now) is often used in more formal or written contexts, for example in reports, presentations, or emails. It structures thoughts and processes in a clear way.
Zunächst werden die Ergebnisse der Studie vorgestellt.
First, the results of the study will be presented.
once / times
'mal' in 'erst mal' and 'zunächst' can both express the first step or a temporary solution. 'erst mal' sounds spoken and casual. It is often used in everyday language when saying what you will do first or for the moment. 'zunächst' sounds more neutral and somewhat more formal; it fits well in explanations, plans, or reports. When it is about a clear sequence, 'zunächst' is more precise. When something sounds spontaneous and colloquial, 'erst mal' fits better.

Für das Projekt sammeln wir zunächst alle wichtigen Informationen.
For the project, we will first gather all the important information.
Nach der Arbeit ruhe ich mich erst mal eine halbe Stunde aus.
After work, I’ll rest for half an hour first.