Through or by the length of; from one end to or toward the other of; lengthwise or in a longitudinal direction through, over, or by the side of: implying motion or direction: as, to walk along a river or highway.By the length; lengthwise; parallel to or in a line with the length.In a line, or with a progressive motion; onward: as, let us walk along.In company; together.Owing to; on account of: with of, formerly with on.