A clear or unobstructed space or expanse of land or water:
— Finally broke out of the forest into the open.

synonym: clear.

Where the air is unconfined:
— The concert was held in the open air.
— Camping in the open.

synonyms: open air, out-of-doors, outdoors.

Dutch: laar
Polish: dwór

A tournament in which both professionals and amateurs may play.

Information that has become public:
— All the reports were out in the open.

synonym: surface.

Cause to open or to become open:
— Mary opened the car door.

synonym: open up.

Roget 529: disclose, discover, dismask^†; draw the veil, draw aside the veil, lift the veil, raise the veil, lift up the veil, remove the veil, tear aside the veil, tear the curtain; unmask, unveil, unfold, uncover, unseal, unkennel; take off the seal, break the seal; lay open, lay bare; expose; open, open up; bare, bring to light.    divulge, reveal, break; squeal [Coll.], tattle [Coll.], sing [Coll.], rat [Coll.], snitch [Coll.]; let into the secret; reveal the secrets of the prison house; tell etc. (inform) 527; breathe, utter, blab, peach; let out, let fall, let drop, let slip, spill the beans, let the cat out of the bag; betray; tell tales, come out of school; come out with; give vent, give utterance to; open the lips, blurt out, vent, whisper about; speak out etc. (make manifest) 525; make public etc. 531; unriddle etc. (find out) 480.1; split.    acknowledge, allow, concede, grant, admit, own, own up to, confess, avow, throw off all disguise, turn inside out, make a clean breast; show one's hand, show one's cards; unburden one's mind, disburden one's mind, disburden one's conscience, disburden one's heart; open one's mind, lay bare one's mind, tell a piece of one's mind [Fr.]; unbosom oneself, own to the soft impeachment; say the truth, speak the truth; turn King's evidence, Queen's evidence; acknowledge the corn [U.S.].    raise the mask, drop the mask, lift the mask, remove the mask, throw off the mask; expose; lay open; undeceive^†, unbeguile^†; disabuse, set right, correct, open the eyes of; d_esillusionner.    be disclosed &c.; transpire, come to light; come in sight etc. (be visible) 446; become known, escape the lips; come out, ooze out, creep out, leak out, peep out, crop-out; show its face, show its colors; discover itself &c.; break through the clouds, flash on the mind.    ... show more

Roget 66: begin, start, commence; conceive, open, dawn, set in, take its rise, enter upon, enter; set out etc. (depart) 293; embark in; incept^†.    initiate, launch, inaugurate.    inchoate, rise, arise, originate.    usher in; lead off, lead the way; take the lead, take the initiative; head; stand at the head, stand first, stand for; lay the foundations etc. (prepare) 673; found etc. (cause) 153; set up, set on foot, agoing^†, set abroach^†, set the ball in motion; apply the match to a train; broach; open up, open the door to.    get underway, set about, get to work, set to work, set to; make a beginning, make a start.    handsel; take the first step, lay the first stone, cut the first turf; break ground, break the ice, break cover; pass the Rubicon, cross the Rubicon; open fire, open the ball; ventilate, air; undertake etc. 676.    come into existence, come into the world; make one's debut, take birth; burst forth, break out; spring up, spring forth, crop up, pop up, appear, materialize.    begin at the beginning, begin ab ovo [Lat.].    begin again, begin de novo; start afresh, make a fresh start, take it from the top, shuffle the cards, reshuffle the cards, resume, recommence.    ... show more

Roget 260: open, ope^†, gape, yawn, bilge; fly open.    perforate, pierce, empierce^†, tap, bore, drill; mine etc. (scoop out) 252; tunnel; transpierce^†, transfix; enfilade, impale, spike, spear, gore, spit, stab, pink, puncture, lance, stick, prick, riddle, punch; stave in.    cut a passage through; make way for, make room for.    uncover, unclose, unrip^†; lay open, cut open, rip open, throw open, pop open, blow open, pry open, tear open, pull open.    ... show more

Dutch: uitklappen

Start to operate or function or cause to start operating or functioning:
— Open a business.

synonym: open up.

Become open:
— The door opened.

synonym: open up.

Dutch: ontsluiten, openen, opengaan

Begin or set in action, of meetings, speeches, recitals, etc..

Spread out or open from a closed or folded state:
— Open the map.

synonyms: spread, spread out, unfold.

Roget 194: become larger etc. (large) etc. 192; expand, widen, enlarge, extend, grow, increase, incrassate^†, swell, gather; fill out; deploy, take open order, dilate, stretch, distend, spread; mantle, wax; grow up, spring up; bud, bourgeon [Fr.], shoot, sprout, germinate, put forth, vegetate, pullulate, open, burst forth; gain flesh, gather flesh; outgrow; spread like wildfire, overrun.    be larger than; surpass etc. (be superior) 33.    render larger etc. (large) etc. 192; expand, spread, extend, aggrandize, distend, develop, amplify, spread out, widen, magnify, rarefy, inflate, puff, blow up, stuff, pad, cram; exaggerate; fatten.    ... show more

Dutch: ontvouwen, openvouwen, uitvouwen

Make available:
— This opens up new possibilities.

synonym: open up.

Dutch: openstellen

Become available:
— An opportunity opened up.

synonym: open up.

Have an opening or passage or outlet.

Make the opening move.

Afford access to:
— The door opens to the patio.

synonyms: afford, give.

Display the contents of a file or start an application as on a computer.

Affording unobstructed entrance and exit; not shut or closed:
— An open door.
— They left the door open.

synonym: unfastened.

Roget 531: published etc. v.; current etc. (news) 532; in circulation, public; notorious; flagrant, arrant; open etc. 525; trumpet-tongued; encyclical, encyclic^†, promulgatory^†; exoteric.    ... show more

Roget 529: disclosed etc. v.; open, public etc. 525.   

Roget 260: open; perforated etc. v.; perforate; wide open, ajar, unclosed, unstopped; oscitant^†, gaping, yawning; patent.    tubular, cannular^†, fistulous; pervious, permeable; foraminous^†; vesicular, vasicular^†; porous, follicular, cribriform^†, honeycombed, infundibular^†, riddled; tubulous^†, tubulated^†; piped, tubate^†.    opening etc. v.; aperient^†.    ... show more

Affording free passage or access.

With no protection or shield:
— Open to the weather.
— An open wound.

synonym: exposed.

Open to or in view of all.

Polish: jawny

Used of mouth or eyes:
— Keep your eyes open.
— His mouth slightly opened.

synonym: opened.

Not having been filled.

Accessible to all.

Not defended or capable of being defended:
— An open city.
— Open to attack.

synonyms: assailable, undefendable, undefended.

of textures Full of small openings or gaps:
— An open texture.

synonym: loose.

Polish: rzadki

Having no protecting cover or enclosure.

set theory Of an interval that contains neither of its endpoints.

Not brought to a conclusion; subject to further thought:
— An open question.

synonyms: undecided, undetermined, unresolved.

Not sealed or having been unsealed:
— The letter was already open.
— The opened package lay on the table.

synonym: opened.

Without undue constriction as from e.g. tenseness or inhibition.

Polish: jawny, otwarty, nieukrywany

Ready or willing to receive favorably.

synonym: receptive.

Open and observable; not secret or hidden:
— Open ballots.

synonym: overt.

Roget 525: manifest, apparent; salient, striking, demonstrative, prominent, in the foreground, notable, pronounced.    flagrant; notorious etc. (public) 531; arrant; stark staring; unshaded, glaring.    defined, definite.    distinct, conspicuous etc. (visible) 446; obvious, evident, unmistakable, indubitable, not to be mistaken, palpable, self-evident, autoptical^†; intelligible etc. 518.    plain, clear, clear as day, clear as daylight, clear as noonday; plain as a pike staff, plain as the sun at noon-day, plain as the nose on one's face, plain as the way to parish church.    explicit, overt, patent, express; ostensible; open, open as day; naked, bare, literal, downright, undisguised, exoteric.    unreserved, frank, plain-spoken etc. (artless) 703; candid (veracious) 543; barefaced.    manifested etc. v.; disclosed etc. 529; capable of being shown, producible; inconcealable^†, unconcealable; no secret.    ... show more

Dutch: openlijk, uitgesproken

Not requiring union membership.

Possibly accepting or permitting:
— Open to interpretation.
— An issue open to question.

synonyms: capable, subject.

Affording free passage or view:
— Open waters.
— The open countryside.

synonym: clear.

Openly straightforward and direct without reserve or secretiveness:
— An open and trusting nature.

synonyms: candid, heart-to-heart.

Roget 703: artless, natural, pure, native, confiding, simple, lain, inartificial^†, untutored, unsophisticated, ingenu^†, unaffected, naive; sincere, frank; open, open as day; candid, ingenuous, guileless; unsuspicious, honest etc. 939; innocent etc. 946; Arcadian^†; undesigning, straightforward, unreserved, aboveboard; simple-minded, single-minded; frank-hearted, open-hearted, single-hearted, simple-hearted.    free-spoken, plain-spoken, outspoken; blunt, downright, direct, matter of fact, unpoetical^†; unflattering.    ... show more

Roget 543: truthful, true; veracious, veridical; scrupulous etc. (honorable) 939; sincere, candid, frank, open, straightforward, unreserved; open hearted, true hearted, simple-hearted; honest, trustworthy; undissembling etc. (dissemble) etc. 544^†; guileless, pure; truth-loving; unperjured^†; true blue, as good as one's word; unaffected, unfeigned, bona fide; outspoken, ingenuous etc. (artless) 703; undisguised etc. (real) 494.    uncontrived.    ... show more

Ready for business.