I agree. The frictional rate of unemployement is not associated with attrition, nor with recession. Under prevailing macroeconomic theory, there is always frictional unemployment, and a good amount of it is voluntary.
The term has had an accepted meaning in macroeconomics for decades (I learned in in a macro class at a university in the early 70s)... I'd suggest that you google it or consult any basic marcroeconomics textbook written in English.