A wave that has been reflected or otherwise returned with sufficient magnitude and delay to be perceived in some form as a wave distinct from that directly transmitted.
"You are the Real Thing! I sent you a 1975 worn out, moldy reel to reel tape with original music from a cherished family member. The tape contained the only history of her music. We didn’t anticipate much would come out of it, since the tape was so old and dirty. As requested, you transferred it to a CD. As we listened the quality of the ..."