Also means
required
Usage Note
erforderlich is a formal word for 'required', common on signs and in official text, as in Anmeldung erforderlich ('registration required'). It comes from erfordern ('to require') and feels more bureaucratic than the everyday nötig. Something is für etwas erforderlich.
Examples
"Eine Anmeldung ist erforderlich."
Natural Translation
Registration is required.
Literal Translation
A registration is required.

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