Merriam-Webster's Collegiate® Dictionary, 11th Edition
ALONG
I. preposition see: ante- Date: before 12th century in a line matching the length or direction of , in the course of , in accordance with ; in ,
II. adverb
Date: 14th century
forward , on , from one to another ,
3. in company ; as a companion , in association,
4. sometime within a specified or implied extent of time, at or to an advanced point , in addition ; also , at hand ; as a necessary or useful item , on hand ; there