Reverie (noun)

1. A state of being lost in one's thoughts, especially pleasant and abstract thoughts.
2. A dreamy or fanciful musing.

Origin:

From the french "rêverie" which means "daydreaming".

Examples:

1. The old man sat on the park bench lost in reverie, while watching the children play.
2. She was in a reverie during the meeting and didn't hear a word that was said.
3. The musician's performance put the audience in a reverie and transported them to a different place.
4. His reverie was interrupted by the sound of the doorbell.
5. The author's writing evokes a sense of reverie in the readers, taking them into a dreamlike state.