electronic equipment that converts sound into electrical signals that can be transmitted over distances and then converts received signals back into sounds; "I talked to him on the telephone"
make a counterattack and return like for like, especially evil for evil; "The Empire strikes back"; "The Giants struck back and won the opener"; "The Israeli army retaliated for the Hamas bombing"
the act of introducing variety (especially in investments or in the variety of goods and services offered); "my broker recommended a greater diversification of my investments"; "he limited his losses by diversification of his product line"
the condition of being varied; "that restaurant's menu lacks diversification; every day it is the same"