NOUN (4)

1. a thorough explanation (usually accompanied by a demonstration) of each step in a procedure or process;
- Example: "she gave me a walk-through of my new duties"

2. a pedestrian passageway through the ground floor of a building;

3. a first perfunctory rehearsal of a theatrical production in which actors read their lines from the script and move as directed;

4. the act of walking in order to view something;
- Example: "the realtor took her on a walk-through of the apartment"

WordNet (r) 3.0 (2006):

walk-through
    n 1: a thorough explanation (usually accompanied by a
         demonstration) of each step in a procedure or process; "she
         gave me a walk-through of my new duties"
    2: a pedestrian passageway through the ground floor of a
       building
    3: a first perfunctory rehearsal of a theatrical production in
       which actors read their lines from the script and move as
       directed
    4: the act of walking in order to view something; "the realtor
       took her on a walk-through of the apartment"