
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.

entrance
The place or opening through which one enters a place; the entrance.
Die Kontrolleure standen direkt am Einlass und prüften die Tickets.
The ticket inspectors were standing right at the entrance and checking the tickets.

inlet
In technology, an opening on a machine or device through which a substance (e.g., gas or liquid) can flow in.
Der Vergaser hat einen Einlass für Luft und einen für Benzin.
The carburetor has one inlet for air and one for gasoline.
'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.
admission / entry
At an event, Eintritt refers to visitors entering. Einlass emphasizes that the organizers let visitors in, often starting at a specified time. When the focus is on entering oneself, Eintritt is appropriate; when the focus is on the organized opening and admission of visitors, Einlass is appropriate.

Der Einlass in den Konzertsaal beginnt um 19 Uhr.
Admission to the concert hall begins at 7 p.m.
Der Eintritt in den Konzertsaal ist ab 19 Uhr möglich.
Entry to the concert hall is possible from 7 p.m. onward.