ENVELOPMENT
enclosure, enclosing, envelopment, inclosure
(noun) the act of enclosing something inside something else
Source: WordNet® 3.1
Etymology
Noun
envelopment (countable and uncountable, plural envelopments)
The act of enveloping.
That which envelops; a covering.
(military) An offensive action in which an attacking force moves over or around the enemy and attacks from the rear; see also pincer movement.
(fencing) 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.
Source: Wiktionary
En*vel"op*ment, n. Etym: [Cf. F. enveloppement.]
1. The act of enveloping or wrapping; an inclosing or covering on all
sides.
2. That which envelops or surrounds; an envelop.
Source: Webster’s Unabridged Dictionary 1913 Edition