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Definition of open
open - adj. ready for business; not having been filled; without undue constriction as from e.g. tenseness or inhibition; affording unobstructed entrance and exit; not shut or closed; affording free passage or access; used of mouth or eyes; having no protecting cover or enclosure; (set theory) of an interval that contains neither of its endpoints; open to or in view of all; accessible to all; not sealed or having been unsealed; not brought to a conclusion; subject to further thought; not requiring union membership; openly straightforward and direct without reserve or secretiveness; affording free passage or view; open and observable; not secret or hidden; with no protection or shield; ready or willing to receive favorably; (of textures) full of small openings or gaps; possibly accepting or permitting; not defended or capable of being defended; noun information that has become public; a tournament in which both professionals and amateurs may play; a clear or unobstructed space or expanse of land or water; where the air is unconfined; verb make available; become available; make the opening move; cause to open or to become open; become open; display the contents of a file or start an application as on a computer; begin or set in action, of meetings, speeches, recitals, etc.; start to operate or function or cause to start operating or functioning; have an opening or passage or outlet; spread out or open from a closed or folded state; afford access to.
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