What are the CPU states found in "top" output?

■ Requirement : Describe CPU states found in output of "top" command
■ OS Environment : Linux, RHEL, Centos
■ Resolution  : 

Cpu(s): 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st

# us -> User CPU time: The time the CPU has spent running users’ processes that are not niced.
# sy -> System CPU time: The time the CPU has spent running the kernel and its processes.
# ni -> Nice CPU time: The time the CPU has spent running users’ process that have been niced.
# wa -> iowait: Amount of time the CPU has been waiting for I/O to complete.
# hi -> Hardware IRQ: The amount of time the CPU has been servicing hardware interrupts.
# si -> Software Interrupts.: The amount of time the CPU has been servicing software interrupts.