Definition of along preposition from the Oxford Advanced American Dictionary

      

    along

     preposition
    preposition
    NAmE//əˈlɔŋ//
     
     
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  1. 1from one end to or toward the other end of something They walked slowly along the road. I looked along the shelves for the book I needed.
  2. 2in a line that follows the side of something long Houses had been built along both sides of the river.
  3. 3 at a particular point on or beside something long You'll find his office along this hallway on the right.
See the Oxford Advanced Learner's Dictionary entry: along