1 [count] : something that forms a back
▪ The tape has an adhesive backing.2 [noncount] : support or aid
▪ The project has received financial backing from several investors.3 [noncount] : the music that is played along with someone who is singing or playing the main tune : the music that accompanies someone — often used before another noun ▪ a backing group ▪ backing music
▪ The tape has an adhesive backing.
▪ The project has received financial backing from several investors.