daydream

(noun) absentminded dreaming while awake. Synonyms: reverie, revery, daydreaming, oneirism, air castle, castle in the air, castle in Spain.

(verb) have a daydream; indulge in a fantasy. Synonyms: dream, woolgather, stargaze.

(verb) have dreamlike musings or fantasies while awake. Synonyms: moon. Example: "She looked out the window, daydreaming."