{adv. phr.} Just as some added fact or news; as something else that I think of. - Used to introduce something related to the general subject, or brought to mind by it. * /We shall expect you; by the way, dinner will be at eight./ * /I was reading when the earthquake occurred, and, by the way, it was The Last Days of Pompeii that I was reading./
See: BY THE WAY.