The Collaborative International Dictionary of English v.0.48:
Sidewalk \Side"walk`\, n. A walk for foot passengers at the side of a street or road; a foot pavement. [U.S.] [1913 Webster]WordNet (r) 3.0 (2006):
sidewalk n 1: walk consisting of a paved area for pedestrians; usually beside a street or roadway [syn: sidewalk, pavement]