Attrition

Attrition may refer to
 * Attrition warfare, the military strategy of wearing down the enemy by continual losses in personnel and material
 * War of Attrition, fought between Egypt and Israel from 1968 to 1970
 * War of attrition (game), a model of aggression in game theory
 * Loss of personnel by withdrawal (military)
 * Attrition (research), loss of participants during an experiment.
 * Attrition (dental), loss of tooth structure by mechanical forces from opposing teeth
 * Attrition (erosion), the wearing away of rocks in rivers or the sea
 * Attrition (film), also known as Final Mission, 2018 american film
 * Imperfect contrition, also known as attrition, in Catholic theology
 * Customer attrition, loss of business clients or customers
 * Language attrition, loss of first language ability by multilingual speakers
 * Second language attrition, loss of second language ability

Proper names

 * Attrition (band), an electronic music band
 * Attrition (website), a security website