
die Andacht
devotional service
A short, reflective religious service, or a state of inner contemplation and prayer.
Jeden Morgen findet in der Kapelle eine kurze Andacht statt.
Every morning, a short devotional service takes place in the chapel.
devotion / service
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devotional service
A short, reflective religious service, or a state of inner contemplation and prayer.
Jeden Morgen findet in der Kapelle eine kurze Andacht statt.
Every morning, a short devotional service takes place in the chapel.

rapt attention
A state of tense, quiet attention with which someone listens, for example, to a speech or to music.
Die Kinder lauschten der Geschichte mit großer Andacht.
The children listened to the story with great rapt attention.
The word comes from 'an-denken' (to think of/about). It describes a state in which you direct your thoughts toward something specific—whether toward God (religious meaning) or toward a story (attentive listening).
Er versank in stiller Andacht.
He sank into quiet devotion.
You can recognize the religious meaning from verbs like 'eine Andacht halten' (to hold a devotional service) or 'eine Andacht besuchen' (to attend a devotional service). The meaning 'Aufmerksamkeit' (attention) is almost always used with the preposition 'mit' (with), e.g. 'mit Andacht lauschen' (to listen with rapt attention).
Der Pfarrer hält am Abend eine Andacht in der Kirche.
The pastor is holding a devotional service in the church this evening.
In a religious context, typical expressions are 'eine Andacht halten' (to hold a devotional service), 'an einer Andacht teilnehmen' (to take part in a devotional service), or 'zur Andacht gehen' (to go to a devotional service).
Viele Gemeindemitglieder nehmen an der wöchentlichen Andacht teil.
Many members of the congregation take part in the weekly devotional service.
In the meaning of 'gespannte Aufmerksamkeit' (rapt attention), 'Andacht' almost always appears with the preposition 'mit' (with). It is often intensified by adjectives such as 'großer' (great), 'voller' (full of), or 'stiller' (quiet).
Er las den Brief seiner Freundin mit stiller Andacht.
He read his girlfriend's letter with quiet rapt attention.
The use of 'Andacht' for 'Aufmerksamkeit' (attention) belongs to a rather elevated, slightly literary style. It expresses a very intense and respectful form of listening.
Das Publikum lauschte dem Konzert in andächtiger Stille.
The audience listened to the concert in reverent silence.
attention
Aufmerksamkeit is the neutral concentration on a speech, music, or something else. In this context, Andacht refers to a particularly quiet and rapt form of listening. Aufmerksamkeit fits ordinary attentive listening; Andacht can fit a state of deep inner concentration.

Das Publikum hörte dem stillen Musikstück mit großer Andacht zu.
The audience listened to the quiet piece of music with rapt attention.
Das Publikum folgte der Rede mit großer Aufmerksamkeit.
The audience followed the speech with great attention.