walk-up

Short definition from Wiktionary

Adjective

1. 1
   Reached by stairs rather than an elevator.
2. 2
   Containing such flats.
3. 3
   For which no appointment is necessary.

Noun

1. 1
   An apartment or block with stairs rather than an elevator.
2. 2
   An informal visit to a control tower by a pilot, typically used as part of pilot training.
3. 3
   A mountain that can be climbed without specialist equipment.
4. 4
   A customer who arrives without a reservation; a walk-in.
5. 5
   An indoor or outdoor stand where food is sold to the public.
6. 6
   Colaptes auratus, northern flicker.
7. 7
   A sequence of notes that raises in pitch stepwise, connecting two or more chords.