Is there a clear definition of absolute standard deviation somewhere?

I for one, don't recognize the term, and Google searches don't help me either. I know standard deviation, symbolized by the Greek letter

*Sigma*, and the population standard deviation, symbolized by

*s*. I generally use the latter one. I know relative standard deviation, which is s/mean, and is usually expressed as a percent.

I don't know if any of those definitions are the same as the one you have for absolute standard deviation -- you're really going to have to scour your textbook, the lab textbook, class notes, someone else's class notes, or ask the instructor.