envelopment

(countable, uncountable) The act of enveloping.
(countable, uncountable) That which envelops; a covering.
(countable, uncountable) An offensive action in which an attacking force moves over or around the enemy and attacks from the rear; see also pincer movement.
(countable, uncountable) 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.