| open | (adjective) ready or willing to receive favorably | Synonyms: receptive |
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| (adjective) affording unobstructed entrance and exit; not shut or closed | Synonyms: unfastened |
| (adjective) affording free passage or access | - |
| (adjective) (set theory) of an interval that contains neither of its endpoints | - |
| (adjective) open and observable; not secret or hidden | Synonyms: overt |
| (adjective) used of mouth or eyes | Synonyms: opened |
| (adjective) ready for business | - |
| (adjective) not having been filled | - |
| (adjective) (of textures) full of small openings or gaps | Synonyms: loose |
| (adjective) openly straightforward and direct without reserve or secretiveness | Synonyms: candid, heart-to-heart |
| (adjective) not requiring union membership | - |
| (adjective) open to or in view of all | - |
| (adjective) possibly accepting or permitting | Synonyms: capable, subject |
| (adjective) without undue constriction as from e.g. tenseness or inhibition | - |
| (adjective) having no protecting cover or enclosure | - |
| (adjective) affording free passage or view | Synonyms: clear |
| (adjective) with no protection or shield | Synonyms: exposed |
| (adjective) accessible to all | - |
| (adjective) not sealed or having been unsealed | Synonyms: opened |
| (adjective) not brought to a conclusion; subject to further thought | Synonyms: undecided, undetermined, unresolved |
| (adjective) not defended or capable of being defended | Synonyms: assailable, undefendable, undefended |
| (noun) information that has become public | Synonyms: surface |
| (noun) a tournament in which both professionals and amateurs may play | - |
| (noun) a clear or unobstructed space or expanse of land or water | Synonyms: clear |
| (noun) where the air is unconfined | Synonyms: open air, out-of-doors, outdoors |
| (verb) make available | Synonyms: open up |
| (verb) become available | Synonyms: open up |
| (verb) make the opening move | - |
| (verb) cause to open or to become open | Synonyms: open up |
| (verb) become open | Synonyms: open up |
| (verb) spread out or open from a closed or folded state | Synonyms: spread, spread out, unfold |
| (verb) display the contents of a file or start an application as on a computer | - |
| (verb) afford access to | Synonyms: afford, give |
| (verb) start to operate or function or cause to start operating or functioning | Synonyms: open up |
| (verb) begin or set in action, of meetings, speeches, recitals, etc. | - |
| (verb) have an opening or passage or outlet | - |
| openbill | (noun) stork with a grooved bill whose upper and lower parts touch only at the base and tip | - |
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| opencast | (adjective) (of mines and mining) worked from the exposed surface | Synonyms: opencut |
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| opencut | (adjective) (of mines and mining) worked from the exposed surface | Synonyms: opencast |
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| opened | (adjective) used of mouth or eyes | Synonyms: open |
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| (adjective) made open or clear | - |
| (adjective) not sealed or having been unsealed | Synonyms: open |
| opener | (noun) a hand tool used for opening sealed containers (bottles or cans) | - |
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| (noun) the first event in a series | - |
| (noun) a person who unfastens or unwraps or opens | Synonyms: undoer, unfastener, untier |
| openhanded | (adjective) given or giving freely | Synonyms: big, bighearted, bounteous, bountiful, freehanded, giving, handsome, liberal |
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| openhandedness | (noun) liberality in bestowing gifts; extremely liberal and generous of spirit | Synonyms: largess, largesse, magnanimity, munificence |
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| openhearted | (adjective) freely communicative; candidly straightforward | - |
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| (adjective) showing or motivated by sympathy and understanding and generosity | Synonyms: benevolent, charitable, good-hearted, kindly, large-hearted, sympathetic |
| opening | (adjective) first or beginning | - |
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| (noun) a recognized sequence of moves at the beginning of a game of chess | Synonyms: chess opening |
| (noun) the act of opening something | - |
| (noun) becoming open or being made open | - |
| (noun) the first of a series of actions | Synonyms: first step, initiative, opening move |
| (noun) a vacant or unobstructed space that is man-made | - |
| (noun) an entrance equipped with a hatch; especially a passageway between decks of a ship | Synonyms: hatchway, scuttle |
| (noun) an aperture or hole that opens into a bodily cavity | Synonyms: orifice, porta |
| (noun) a possible alternative | Synonyms: possibility, possible action |
| (noun) the initial part of the introduction | - |
| (noun) the first performance (as of a theatrical production) | Synonyms: curtain raising, opening night |
| (noun) a ceremony accompanying the start of some enterprise | - |
| (noun) an open or empty space in or between things | Synonyms: gap |
| (noun) opportunity especially for employment or promotion | - |
| openly | (adverb) in an open way | - |
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| openmouthed | (adjective) with eyes or mouth open in surprise | Synonyms: goggle-eyed, popeyed |
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| openness | (noun) characterized by an attitude of ready accessibility (especially about one's actions or purposes); without concealment; not secretive | Synonyms: nakedness |
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| (noun) willingness or readiness to receive (especially impressions or ideas) | Synonyms: receptiveness, receptivity |
| (noun) without obstructions to passage or view | - |
| openwork | (noun) ornamental work (such as embroidery or latticework) having a pattern of openings | - |
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