attrit vs depreciation

attrit

noun
  • One who voluntarily or involuntarily leaves a company; a termed employee. 

verb
  • To be reduced in quantity through attrition. 

  • To lose, or to kill, troops by attrition due to sustained firepower. 

  • To engage in attrition; to quit or drop out. 

  • To wear down through attrition, especially mechanical attrition. 

depreciation

noun
  • The state of being depreciated; disparagement. 

  • The decline in value of assets. 

  • The measurement of the decline in value of assets. Not to be confused with impairment, which is the measurement of the unplanned, extraordinary decline in value of assets. 

How often have the words attrit and depreciation occurred in a corpus of books? (source: Google Ngram Viewer )