der Einlass
admission
Permission or the process of entering or being let into a place, often at a specific time.
Der Einlass zum Konzert beginnt um 19 Uhr.
Admission to the concert begins at 7 p.m.

admission / entrance
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admission
Permission or the process of entering or being let into a place, often at a specific time.
Der Einlass zum Konzert beginnt um 19 Uhr.
Admission to the concert begins at 7 p.m.

'Der Einlass' (admission/entrance) is the noun related to the separable verb 'einlassen' (to let in). The verb means 'to let someone enter,' and the noun describes the action or permission for it.
Die Security ließ uns ohne Ticket nicht ein.
Security didn't let us in without a ticket.
'Einlass' (admission) as a process or time answers the question 'Wann?' (When?). 'Der Eingang' (the entrance), on the other hand, is the place and answers the question 'Wo?' (Where?). You say 'Der Einlass ist um 20 Uhr' (Admission is at 8 p.m.), but 'Der Eingang ist links' (The entrance is on the left).
Wann ist der Einlass für das Festival?
When is admission for the festival?
In the context of events, 'Einlass' (admission) is often combined with a time or an age restriction. Typical verbs are 'gewähren' (to grant), 'verweigern' (to deny), or 'beginnen' (to begin).
Einlass ist nur für volljährige Personen.
Admission is only for adults.
In technology, 'Einlass' (inlet) is a technical term. It refers to an opening on a machine through which a substance such as liquid or gas enters.
Der Motor hat einen Einlass für das Luft-Kraftstoff-Gemisch.
The engine has an inlet for the air-fuel mixture.
access / entrance
'der Zugang' and 'der Einlass' can both mean that you get into a place. 'Zugang' is more general: it can refer to an entrance, a route, or also authorization to use something. 'Einlass' is often used for events, buildings, or controlled places when someone is let in. It often involves a time, a ticket, or a check. The words can be confused when it is about permission to go inside. For concerts, museums, or exams, 'Einlass' often sounds more natural; for routes or digital rights, 'Zugang' is more common.

Der Einlass zum Konzert beginnt um achtzehn Uhr.
Admission to the concert begins at six p.m.
Ohne Passwort hast du keinen Zugang zu den Kundendaten.
Without a password, you have no access to the customer data.