Attrition

Definition: Attrition is the rate at which a workforce is gradually reduced due to employees leaving a firm through normal means such as retirement, resignation and death.
It is a gradual, natural reduction in personnel (or membership), as through retirement, resignation, or death.
Contrary to forced labor reductions (firing, layoffs).
It can be also used to indicate the action of not filling openings created by voluntary resignation and normal retirements.
Also called: churn or employee turnover.

More on attrition. More on termination of employment: Dismissal, Downsizing, Employee Exit Management, Exit Interview, Layoff, more...