Of a containing space (as a house, room, box, or drawer): having its door, lid, etc., or some part of its enclosing boundary removed, so that…

Of an area of land, water, etc.: open, clear, unobstructed; (also) open to the elements or to general view; unsheltered, exposed. Now archaic and E…

Not enclosed or shut in; (of land, fields, etc., often with reference to the enclosure of common land) not surrounded with a fence or other…

Not shut in or enclosed; in an open location, open to view. Also: approachable, accessible. Frequently with to. Obsolete.

Without an enclosure or hedge; unenclosed, open.

(un-, prefix1 affix 2 affix 3.)

Not enclosed (in various senses); esp. (of a space, area, piece of land, etc.) not surrounded by a wall, fence, hedge, etc.; open. Cf. enclosure, n.…