Transition, Slew, skew and cell Delay

 Transition:

• Time taken by the signal can change their state from 0 to 1 or 1 to 0 is called as the Transition

Slew:

• The rate of change of transition is called as Slew 

Skew:

• The clock path arrival difference between the two successive clocks is called as Skew

Cell Delay:

• Cell delay is based on input transition and output load is called as cell delay 
• This delay is based on cell rise and cell fall delay