allotment vs envelopment

allotment

noun
  • The act of allotting. 

  • The allowance of a specific amount of money or other credit of a particular thing to a particular person. 

  • A plot of land rented from the council for growing fruit and vegetables. 

  • Something allotted; a share, part, or portion granted or distributed 

envelopment

noun
  • The act of enveloping. 

  • An offensive action in which an attacking force moves over or around the enemy and attacks from the rear; see also pincer movement. 

  • That which envelops; a covering. 

  • An action to seize the opponent's blade in one line and lead it (without losing contact) through a full circle to end in the same line. 

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