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