Definition from Wiktionary, the free dictionary
Alternative forms 
defecation (plural defecations)
- Act or process of voiding feces from bowels.
- Any of several processes for the removal of impurities, or for clarifying various materials.
- See also Wikisaurus:defecation
act or process of voiding excrement
process of removing impurities
- “defecation” in Douglas Harper, Online Etymology Dictionary (2001).