The Collaborative International Dictionary of English v.0.48:

Street \Street\ (str[=e]t), n. [OE. strete, AS. str[=ae]t, fr.
   L. strata (sc. via) a paved way, properly fem. p. p. of
   sternere, stratum, to spread; akin to E. strew. See Strew,
   and cf. Stratum, Stray, v. & a.]
   1. Originally, a paved way or road; a public highway; now
      commonly, a thoroughfare in a city or village, bordered by
      dwellings or business houses.
      [1913 Webster]

            He removed [the body of] Amasa from the street unto
            the field.                            --Coverdale.
      [1913 Webster]

            At home or through the high street passing.
                                                  --Milton.
      [1913 Webster]

   Note: In an extended sense, street designates besides the
         roadway, the walks, houses, shops, etc., which border
         the thoroughfare.
         [1913 Webster]

               His deserted mansion in Duke Street. --Macaulay.
         [1913 Webster]

   2. the roadway of a street[1], as distinguished from the
      sidewalk; as, children playing in the street.
      [PJC]

   3. the inhabitants of a particular street; as, the whole
      street knew about their impending divorce.
      [PJC]

   The street (Broker's Cant), that thoroughfare of a city
      where the leading bankers and brokers do business; also,
      figuratively, those who do business there; as, the street
      would not take the bonds.

   on the street,
      (a) homeless.
      (b) unemployed.
      (a) not in prison, or released from prison; the murderer
          is still on the street.

   Street Arab, Street broker, etc. See under Arab,
      Broker, etc.

   Street door, a door which opens upon a street, or is
      nearest the street.

   street person, a homeless person; a vagrant.
      [1913 Webster +PJC]

   Syn: See Way.
        [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Wall Street \Wall Street\
   A street towards the southern end of the borough of
   Manhattan, New York City, extending from Broadway to the East
   River; -- so called from the old wall which extended along it
   when the city belonged to the Dutch. It is the chief
   financial center of the United States, hence the name is
   often used for the money market and the financial interests
   of the country; -- in American financial publications, also
   referred to as the street.
   [Webster 1913 Suppl. +PJC]

WordNet (r) 3.0 (2006):

the Street
    n 1: used to allude to the securities industry of the United
         States [syn: Wall Street, the Street]