envelopment

Noun

 * 1) The act of enveloping.
 * 2) That which envelops; a covering.
 * 3)  An offensive action in which an attacking force moves over or around the enemy and attacks from the rear; see also pincer movement.
 * 4)  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.