open

adjective

(of a sports competition) enterable by amateurs and professionals
available to the public
ajar (window, door, etc.)
freely giving of info, feelings, free to be seen
open-minded, freely accepting of input
free for passage, entry, or utilization (e.g. the roads are open to traffic, the door is open to them, the store is open for business)
spacious, unenclosed
vulnerable/subject to, exposed

L12541 on Wikidata ↗

verb

move something, e.g. a door, to allow things to pass through it
(cause to) become open; change of state, free for passage/entry
begin

L1272 on Wikidata ↗

noun

type of sports competition

L324741 on Wikidata ↗

Wiktionary

Pronunciation: /ˈəʊ.pən/ / /ˈɒ.pɪn/ / /ˈoʊ.pən/

adj

Etymology: Adjective from Middle English open, from Old English open (“open”), from Proto-West Germanic *opan, from Proto-Germanic *upanaz (“open”), from Proto-Indo-European *upo (“up from under, over”). Cognates * Scots apen (“open”) * Saterland Frisian eepen (“open”) * West Frisian iepen (“open”) * Cimbrian offe (“open”) * Dutch open (“open”) * German offen (“open”) * Vilamovian ufa, uffa (“open”) * Yiddish אָפֿן (ofn, “open”) * Danish åben (“open”) * Icelandic opinn (“open”) * Norwegian Bokmål åpen (“open”) * Norwegian Nynorsk open (“open”) * Swedish öppen (“open”) Compare also Latin supinus (“on one's back, supine”), Albanian hap (“to open”). Related to up. Verb from Middle English openen, from Old English openian (“to open”), from Proto-West Germanic *opanōn, from Proto-Germanic *upanōną (“to raise; lift; open”), from Proto-Germanic *upanaz (“open”, adjective). Cognate with Saterland Frisian eepenje (“to open”), West Frisian iepenje (“to open”), Dutch openen (“to open”), German öffnen (“to open”), Danish åbne (“to open”), Swedish öppna (“to open”), Norwegian Bokmål åpne (“to open”), Norwegian Nynorsk and Icelandic opna (“to open”). Related to English up. Noun from Middle English open (“an aperture or opening”), from the verb. In the sports sense, however, a shortening of “open competition”.

Physically unobstructed, uncovered, etc.
“Come in – the door's open.”
“The ice has cleared and the channel is open again.”
Physically unobstructed, uncovered, etc.
“The jewellery box was lying open.”
“Don't just stand there with your mouth open!”
Physically unobstructed, uncovered, etc.
“She greeted them with open arms.”
“The book was open at page 23.”
Physically unobstructed, uncovered, etc.
“It was a large, open room.”
“Most of the site was occupied by huts, but there was an open area in the centre.”
Physically unobstructed, uncovered, etc.
“an open fracture”
Physically unobstructed, uncovered, etc.
Physically unobstructed, uncovered, etc.
Physically unobstructed, uncovered, etc.
“open sandwich”
“Starry food is fun to make. You can buy bright yellow American mustard (which isn’t too strong!) in squeezy bottles and pipe stars on to hot dogs and open burgers or sandwiches.”
Physically unobstructed, uncovered, etc.
“an open winter”
“He desires me to tell you that the present open weather induces him to accept Mr Vernon's invitation to prolong his stay in Sussex that they may have some hunting together.”
Able to be used or interacted with in some way.
“Your bank account is now open.”
“Phone lines open at 10 pm.”
Able to be used or interacted with in some way.
“Banks are not open on bank holidays.”
“Several new shops have opened in Market Street.”
Able to be used or interacted with in some way.
“I hereby declare this fete open.”
“The school has an open day on Saturday.”
Able to be used or interacted with in some way.
“I am open to new ideas.”
“Wherefore if Demetrius […] have a matter against any man, the law is open and there are deputies.”
Able to be used or interacted with in some way.
“open to question; open to attack; open to criticism”
“The service that I truly did his life, / Hath left me open to all injuries.”
Able to be used or interacted with in some way.
“I couldn't save my changes because another user had the same file open.”
Able to be used or interacted with in some way.
“You're getting short of memory because you have too many apps open.”
Not hidden or restricted.
“It is a blatant example of open criminality.”
“His thefts were too open.”
Not hidden or restricted.
“Nowadays people are more open about their sexuality.”
“1731-1735, Alexander Pope, Moral Essays with aspect open, shall erect his head”
Not hidden or restricted.
“He published an open letter to the governor on a full page of The New York Times.”
Not hidden or restricted.
“You will observe that this is an open letter and we reserve the right to mention it to the judge should the matter come to trial.”
Not hidden or restricted.
“We hope that all aspects of the project will be open rather than paywalled.”
Not hidden or restricted.
“Since the launch early last year of […] two Silicon Valley start-ups offering free education through MOOCs, massive open online courses, the ivory towers of academia have been shaken to their foundations. University brands built in some cases over centuries have been forced to contemplate the possibility that information technology will rapidly make their existing business model obsolete.”
Not hidden or restricted.
Not hidden or restricted.
“Compared to their last match, which was a dour and defensive affair, this was a very open game.”
Not completed or finalised.
“an open question”
“to keep an offer or opportunity open”
Not completed or finalised.
“I've got open orders for as many containers of red durum as you can get me.”
Not completed or finalised.
“an open curve, an open circuit”
Not completed or finalised.
Not completed or finalised.
Not completed or finalised.
Having a free variable.
Which is part of a predefined collection of subsets of X, that defines a topological space on X.
Of a note, played without pressing the string against the fingerboard.
Of a note, played without closing any finger-hole, key or valve.
Uttered with a relatively wide opening of the articulating organs; said of vowels.
“"Supposing somebody sees you, with all those flowers too? Supposing somebody writes him a letter? Ooooh!" (a pure round open Tamil O.)”
Uttered, as a consonant, with the oral passage simply narrowed without closure.
Source code of a computer program that is not within the text of a macro being generated.
Having component words separated by spaces, as opposed to being joined together or hyphenated; for example, time slot as opposed to timeslot or time-slot.
Of a club, bat or other hitting implement, angled upwards and/or (for a right-hander) clockwise of straight.

noun

Open or unobstructed space; an exposed location.
“I can't believe you left the lawnmower out in the open when you knew it was going to rain this afternoon!”
“Wary of hunters, the fleeing deer kept well out of the open, dodging instead from thicket to thicket.”
Public knowledge or scrutiny; full view.
“We have got to bring this company's corrupt business practices into the open.”
A defect in an electrical circuit preventing current from flowing.
“The electrician found the open in the circuit after a few minutes of testing.”
A sports event in which anybody can compete, especially or originally irrespective of amateur or professional status.
“the Australian Open”
The act of something being opened, such as an e-mail message.
“The total number of opens from original, or unique, subscribers.”

verb

To make or become physically unobstructed, uncovered, etc.
“Turn the doorknob to open the door.”
“The door opened all by itself.”
To make or become physically unobstructed, uncovered, etc.
“The icebreaker opened the channel.”
“The ice melted away and the channel opened.”
To make or become physically unobstructed, uncovered, etc.
“You can open your eyes now!”
“Her eyes opened wide.”
To make or become physically unobstructed, uncovered, etc.
“to open a closed fist”
“to open matted cotton by separating the fibres”
To make or become physically unobstructed, uncovered, etc.
“Follow agency policy, or open the bed by folding the top linens back.”
To make or become physically unobstructed, uncovered, etc.
“Jeff opens his hand revealing a straight flush.”
To make or become physically unobstructed, uncovered, etc.
To make or become physically unobstructed, uncovered, etc.
To cause or allow a gap to form or widen.
“Mudchester Rovers opened a sizeable lead on their rivals.”
“A link opened under the strain, and the chain came apart.”
To cause or allow a gap to form or widen.
To make or become available for use or interaction.
“He opened a secret bank account in Switzerland.”
“We're opening the phone lines in ten minutes.”
To make or become available for use or interaction.
“I will open the shop an hour early tomorrow.”
“The summer fete was opened by the mayor.”
To make or become available for use or interaction.
“Reading this book will open you to new ideas.”
“This policy will open the government to criticism.”
To make or become available for use or interaction.
“I can't open the file because someone else is editing it.”
To make or become available for use or interaction.
“Please open the lights, the (electric) fan, the TV.”
To start or begin.
“The show was opened by a terrible Elvis impersonator.”
“Our band opened, and they came on second.”
To start or begin.
“Our band opened for Nirvana.”
To start or begin.
“The meeting opened with a statement from the chairman.”
To start or begin.
“I don't want to open that subject.”
To start or begin.
“to open a discussion”
“to open fire upon an enemy”
To start or begin.
“Click this icon to open Microsoft Word.”
To start or begin.
To start or begin.
“After the first two players fold, Julie opens for $5.”
To make an open relationship or marriage, i.e., with possible additional relationships.
“He assured me, unequivocally, that he was, and that he rather enjoyed the side benefits of my trysts: I was happier and living more honestly, as well as off his back about many of the issues that had been troublesome for me before we opened our relationship.”
“I wouldn’t do it unless there is a reason for it, I wouldn’t open a marriage just for fun. I think it’s too dangerous. I know I’m a monogamous type of person—I like just one person at a time; actually sleeping with more than one person in separate relationships is too confusing.”
To disclose; to reveal; to interpret; to explain.
“The king opened himself to some of his council, that he was sorry for the earl's death.”
“Unto thee have I opened my cause.”