Wearing or grinding down by friction.

The gradual reduction in a tangible or intangible resource due to causes that are passive and do not involve productive use of the resource.

(human resources) A gradual, natural reduction in membership or personnel, as through retirement, resignation, or death.

To grind or wear down through friction.

“attritioned teeth; attritioned rock”

To reduce the number of (jobs or workers) by not hiring new employees to fill positions that become vacant (often with out).

“As a result of the new policy, people were being attritioned out.”

To undergo a reduction in number.

“The cohort of one hundred students had attritioned to sixty by the end of secondary school.”