Read the dictionary definition of residual. All definitions for this word.
1. (often plural) a payment that is made to a performer or writer or director of a television show or commercial that is paid for every repeat showing
1. he could retire on his residuals
2. something left after other parts have been taken away
1. there was no remainder
2. he threw away the rest
3. he took what he wanted and I got the balance
3. relating to or indicating a remainder
1. residual quantity