Available Definitions:
1) a. - Inclosing; encircling.
2) n. - An encompassing.
3) n. - The things which surround or environ; external or attending circumstances or conditions.
4) v. t. - To inclose, as a body of troops, between hostile forces, so as to cut off means of communication or retreat; to invest, as a city.
5) n. - A method of hunting some animals, as the buffalo, by surrounding a herd, and driving them over a precipice, into a ravine, etc.