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attrition

1 ENTRIES FOUND:
attrition ˈtrɪʃən/ noun
attrition
ˈtrɪʃən/
noun
Britannica Dictionary definition of ATTRITION
[noncount] formal
chiefly US : a reduction in the number of employees or participants that occurs when people leave because they resign, retire, etc., and are not replaced
called also (British) natural wastage
: the act or process of weakening and gradually defeating an enemy through constant attacks and continued pressure over a long period of time used especially in the phrase war of attrition