at·tri·tion /əˈtrɪʃən/ Show Spelled[uh-trish-uhn]
1.a reduction or decrease in numbers, size, or strength: Our club has had a high rate of attrition because so many members have moved away.
2.a wearing down or weakening of resistance, especially as a result of continuous pressure or harassment: The enemy surrounded the town and conducted a war of attrition.
3.a gradual reduction in work force without firing of personnel, as when workers resign or retire and are not replaced.
4.the act of rubbing against something; friction.
5.a wearing down or away by friction; abrasion.