1. preposition /əˈlɒŋ,əˈlɔŋ/
They were waiting for me in the drawing-room, which is a very large room, stretching along the entire front of the house, with three long windows reaching down to the floor.
Swiftly and silently he made his way along the track which ran through the meadows.
2. adverb /əˈlɒŋ,əˈlɔŋ/
I am going to the store. Do you want to come along?
b) Onward, forward, with progressive action.
Dont stop here. Just move along.
See Also: all along, along of, along the lines, along those lines, along with, come along, get along, rock along
Wikipedia foundation.