1.with a forward motion;
we drove along admiring the view
2.in accompaniment or as a companion;
his little sister came along to the movies
3.to a more advanced state;
the work is moving along
4.in addition (usually followed by `with');
we sent them food and some clothing went along in the package
5.in line with a length or direction (often followed by `by' or `beside');
pass the word along