evacuation evacuation /iːˈvækjəˈweɪʃən/

noun

1. () The act of removing the contents of something  ( emptying , voidance , evacuation )
   the act of removing the contents of something
   
2. () The act of evacuating; leaving a place in an orderly fashion; especially for protection  ( evacuation )
   the act of evacuating; leaving a place in an orderly fashion; especially for protection
   
3. The bodily process of discharging waste matter  ( elimination , evacuation , excreting , excretion , voiding )
   the bodily process of discharging waste matter
     The kidneys play a vital role in the excretion of waste products from the body.
   The kidneys play a vital role in the excretion of waste products from the body.