Meaning Of HR Terms

Hi,
I am new in HR. Can anyone help me with meaning and difference between Attrition, Separation & turnover.......I am too confused.
Please guide me.
Regards,

Attrition
Attrition refers to reduction in staff that are vacated through resignation, reassignment, transfer, retirement, or means other than layoffs.
Separation
Any termination of employment. It is generally classifiable as a layoff, voluntary quit, or discharge.
Employee Turnover
The ratio of the number of workers that had left in a given time period to the average number of workers.

Thanks a ton...
Attrition refers to reduction in staff that are vacated through resignation, reassignment, transfer, retirement, or means other than layoffs.
Separation
Any termination of employment. It is generally classifiable as a layoff, voluntary quit, or discharge.
Employee Turnover
The ratio of the number of workers that had left in a given time period to the average number of workers.[/quote]

m also new in HR,My self lata.daily i read your mail,and i learn somthing ney from you sir.but when i send any query them i am anable to get my answer.iI read,but i get some other things.
But thank You Very Much.
[/b]

ATTRITION
it happens only when resignation, reassignment. but not due to transfer or retirement.
from
valbooj..