why do we need to define lCD_COMMANDUS and LCD_DATAUS

[skimask]

But i need to know the meening of lcd command delay and data delay ... In my application i have to know the time period every statement consums ... so i need to understand when these delays take place ?

Huh? Didn't I just tell you what the DEFINE's meant?
Light an LED before the LCD command, turn off the LED after the LCD command, measure the pulse width on a 'scope. Or run it thru the MPLAB simulator...