
der Akt
act
A main section of a play, opera, or ballet.
Die dramatischste Szene findet im zweiten Akt statt.
The most dramatic scene takes place in the second act.
act / nude / hassle
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act
A main section of a play, opera, or ballet.
Die dramatischste Szene findet im zweiten Akt statt.
The most dramatic scene takes place in the second act.

act
An action or deed that often has a formal, ceremonial, or symbolic character.
Die Unterzeichnung des Friedensvertrags war ein historischer Akt.
The signing of the peace treaty was a historic act.

nude
In visual art, the depiction of a naked human body.
Der Maler ist berühmt für seine detailreichen Akte.
The painter is famous for his detailed nudes.

hassle
Colloquial for a very complicated, time-consuming, or bureaucratic matter.
Die Beantragung des neuen Passes war ein einziger Akt.
Applying for the new passport was one big hassle.

act
A euphemistic or formal term for sexual intercourse.
In der Biologie wird die Fortpflanzung oft als reproduktiver Akt beschrieben.
In biology, reproduction is often described as a reproductive act.
'Der Akt' (act) is not a general word for an action like the English 'act'. For a general action, German usually uses 'die Tat' (deed) or 'die Handlung' (action).
Einem alten Menschen über die Straße zu helfen, ist eine gute Tat.
Helping an elderly person cross the street is a good deed.
This meaning is specific to the world of theater, opera, or ballet. When you hear 'erster Akt' (first act) or 'dritter Akt' (third act), it always means a main section of a piece.
Der Vorhang fiel nach dem ersten Akt.
The curtain fell after the first act.
In the meaning of a formal action, 'Akt' (act) is often combined with an adjective or a genitive construction, e.g. 'ein symbolischer Akt' (a symbolic act), 'ein feierlicher Akt' (a solemn act), or 'ein Akt der Verzweiflung' (an act of desperation).
Die Übergabe des Geschenks war ein rein symbolischer Akt.
The handing over of the gift was a purely symbolic act.
When 'Akt' (nude) is used in the context of art, painting, drawing, or photography, it always means the depiction of a naked human body.
Im Museum gibt es eine ganze Abteilung nur für Akte aus dem 19. Jahrhundert.
In the museum, there is an entire section just for nudes from the 19th century.
In colloquial language, 'ein Akt' (a hassle) describes a very complicated or annoying matter. This is often intensified with 'ein riesen Akt' (a huge hassle) or 'ein einziger Akt' (one big hassle).
Ein Visum zu bekommen, war ein riesen Akt mit viel Papierkram.
Getting a visa was a huge hassle with a lot of paperwork.
deed / act
Tat and Akt can both refer to an action that has been carried out. Tat focuses more on the concrete event itself, whereas Akt can also sound formal, ceremonial, or symbolic. Use “Tat” for the event and “Akt” for an action whose symbolic character is emphasized.

Das Niederlegen der Blumen war ein feierlicher Akt des Gedenkens.
Laying down the flowers was a solemn act of remembrance.
Seine Tat, die alte Fahne zu tragen, zeigte seinen Respekt vor der Geschichte.
His deed of carrying the old flag showed his respect for history.