Openとは 意味・読み方・使い方

語源

Adjective from 中期英語 open, from 古期英語 open (“open”), from Proto-West Germanic *opan, from Proto-Germanic *upanaz (“open”), from Proto-Indo-European *upo (“up from under, over”).

Verb from 中期英語 openen, from 古期英語 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 中期英語 open (“an aperture or opening”), from the verb. In the sports sense, however, a shortening of “open competition”.

発音

• (英国発音)
  • (Received Pronunciation) IPA: /ˈəʊ.pən/
  • (Northumbria) IPA: /ˈɒ.pɪn/
• (General American) IPA: /ˈoʊ.pən/
• (General Australian) IPA: /ˈəʉ.pən/
• 韻: -əʊpən
• ハイフネーション: o‧pen

形容詞

open (comparative more open or (phonetics) opener, superlative most open or (phonetics) openest)

1. (usually not comparable) Physically unobstructed, uncovered, etc.
   1. Able to have something pass through or along it.

      Come in – the door's open.

      The ice has cleared and the channel is open again.

   2. Not covered, sealed, etc.; having an opening or aperture showing what is inside.

      The jewellery box was lying open.

      Don't just stand there with your mouth open!

      Along the street ran an open sewer.

   3. Not physically drawn together, folded or contracted.

      She greeted them with open arms.

      The book was open at page 23.

      an open hand; an open flower; an open (loosely woven) fabric

      • 1700, [John] Dryden, “The Flower and the Leaf: Or, The Lady in the Arbour. A Vision.”, in Fables Ancient and Modern; […], London: […] Jacob Tonson, […], →OCLC:

        Each, with open arms, embraced her chosen knight.

      • 2005, Pamela J. Carter, Susan Lewsen, Lippincott's Textbook for Nursing Assistants, page 277:

        When the top sheet, blanket, and bedspread of a closed bed are turned back, or fanfolded, the closed bed becomes an open bed, or a bed ready to receive a patient or resident.

   4. Of a space, free of objects and obstructions.

      It was a large, open room.

      Most of the site was occupied by huts, but there was an open area in the centre.

      Soon we left the forest behind and we were out in open country.

      • 1908 October, Kenneth Grahame, The Wind in the Willows, New York, N.Y.: Charles Scribner’s Sons, →OCLC:

        The open road, the dusty highway […]

   5. (medicine) Resulting from an incision, puncture or any other process by which the skin no longer protects an internal part of the body.

      an open fracture

   6. (sometimes proscribed) Unlocked or unlatched but not physically open.
   7. (engineering, gas and liquid flow, of valve or damper) In a position allowing fluid to flow.
   8. Of a sandwich, etc.: composed of a single slice of bread with a topping.

      Synonyms: open-face, open-faced

      open sandwich

      • 2001, Jennie Walters, Caz’s Birthday Blues (Party Girls)‎, London: Hodder Children’s Books, →ISBN:

        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.

      • 2012, Jo McAuley, “[Meat and Poultry] Turkey Burgers with Spicy Salsa”, in Hamlyn QuickCook: Low Fat, London: Hamlyn, →ISBN, page 152:

        When the burgers are ready, place them on the toasted rolls with the romaine lettuce leaves and top with the salsa. Serve as open burgers.

      • 2015, Michael Robotham, chapter 17, in Close Your Eyes, London: Sphere, →ISBN, page 133:

        Sunday morning in Wellow and we feast on open bagels with grilled ham, tomato and Swiss cheese, requested and highly praised.

   9. (now regional) Not of a quality to prevent communication, as by closing waterways, blocking roads, etc.; hence, not frosty or inclement; mild; used of the weather or the climate.

      an open winter

      • c. 1794, Jane Austen, Lady Susan:

        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.

2. Able to be used or interacted with in some way.
   1. (not comparable) Available for use or operation.

      Your bank account is now open.

      Phone lines open at 10 pm.

      This is the only option open to us.

   2. (not comparable) Actively conducting or prepared to conduct business.

      Banks are not open on bank holidays.

      Several new shops have opened in Market Street.

   3. (not comparable) Allowing entrance to visitors or the public.

      I hereby declare this fete open.

      The school has an open day on Saturday.

   4. (comparable) Receptive.

      I am open to new ideas.

      • 1611, The Holy Bible, […] (King James Version), London: […] Robert Barker, […], →OCLC, Acts 19:38:

        Wherefore if Demetrius […] have a matter against any man, the law is open and there are deputies.

      • 2021 April 2, Ciara Nugent, “Can Public Transit Survive the Pandemic? London's New Transport Commissioner Wants You to Believe It Can”, in Time‎:

        A U.K. survey found attitudes toward public transit had been set back by two decades, with only 43% of drivers open to using their car less, even if public transport improves.

   5. (comparable, with 'to') Susceptible or vulnerable (to the stated means).

      open to question; open to attack; open to criticism

      • c. 1596–1599 (date written), William Shakespeare, “The Second Part of Henry the Fourth, […]. Epilogue.”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, →OCLC, [Act V, scene ii]:

        The service that I truly did his life, / Hath left me open to all injuries.

   6. (computing, not comparable, of a file, document, etc.) In current use; connected to as a resource.

      I couldn't save my changes because another user had the same file open.

   7. (computing, of a program or application, especially one with a screen-based interface) Running.

      You're getting short of memory because you have too many apps open.

3. Not hidden or restricted.
   1. Not concealed; overt.

      It is a blatant example of open criminality.

      • c. 1597 (date written), William Shakespeare, “The Merry Wiues of Windsor”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, →OCLC, [Act I, scene iii]:

        His thefts were too open.

      • 1667, John Milton, “Book III”, in Paradise Lost. […], London: […] [Samuel Simmons], and are to be sold by Peter Parker […]; [a]nd by Robert Boulter […]; [a]nd Matthias Walker, […], →OCLC; republished as Paradise Lost in Ten Books: […], London: Basil Montagu Pickering […], 1873, →OCLC:

        That I may find him, and with secret gaze / Or open admiration him behold.

   2. Of a person, not concealing their feelings, opinions, etc.; candid, ingenuous.

      Nowadays people are more open about their sexuality.

      • 1731-1735, Alexander Pope, Moral Essays

        with aspect open, shall erect his head

      • c. 1603–1604 (date written), William Shakespeare, “The Tragedie of Othello, the Moore of Venice”, in Mr. William Shakespeares Comedies, Histories, & Tragedies […] (First Folio), London: […] Isaac Iaggard, and Ed[ward] Blount, published 1623, →OCLC, [Act I, scene iii]:

        The Moor is of a free and open nature.

      • 1705, J[oseph] Addison, Remarks on Several Parts of Italy, &c. in the Years 1701, 1702, 1703, London: […] Jacob Tonson, […], →OCLC:

        The French are always open, familiar, and talkative.

      • 2001, Xiaopei He, “Chinese Queer (Tongzhi) Women Organizing in the 1990s”, in Ping-Chun Hsiung, Maria Jaschok, Cecilia Milwertz, Red Chan, editors, Chinese Women Organizing: Cadres, Feminists, Muslims, Queers‎, Berg, →ISBN, →LCCN, →OCLC, page 41:

        Due to severe and pervasive discrimination, people dared not be open about their homosexuality, and because no one would be open, social prejudice and discrimination became even stronger.

   3. (not comparable) Public.

      He published an open letter to the governor on a full page of The New York Times.

   4. (law, of correspondence) Written or sent with the intention that it may made public or referred to at any trial, rather than by way of confidential private negotiation for a settlement.

      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.

   5. (not comparable) With open access, of open science, or both.

      We hope that all aspects of the project will be open rather than paywalled.

   6. (computing, education) Made public, usable with a free licence and without proprietary components.
      • 2013 July 20, “The attack of the MOOCs”, in The Economist, volume 408, number 8845:

        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.

   7. (sports) Of a tournament or competition, allowing anyone to enter, especially or originally irrespective of professional or amateur status.
   8. (sports and games) Characterised by free-flowing play.

      Compared to their last match, which was a dour and defensive affair, this was a very open game.

4. Not completed or finalised.
   1. Not settled; not decided or determined; not withdrawn from consideration.

      an open question

      to keep an offer or opportunity open

   2. (sometimes business) Not fulfilled or resolved; incomplete.

      I've got open orders for as many containers of red durum as you can get me.

   3. Not having one end joined to the other; not forming a closed loop.

      an open curve, an open circuit

   4. (electricity, of a switch or circuit breaker) In a position such that a circuit is not completed, preventing electricity from flowing.
   5. (graph theory, of a walk) Having different first and last vertices.
   6. (phonetics, of a syllable) Ending in a vowel; not having a coda.
5. (mathematics, logic, of a formula) Having a free variable.
6. (mathematics, topology, of a set) Which is part of a predefined collection of subsets of ${\displaystyle X}$, that defines a topological space on ${\displaystyle X}$.
7. (music, stringed instruments) Of a note, played without pressing the string against the fingerboard.
8. (music) Of a note, played without closing any finger-hole, key or valve.
9. (phonetics, sometimes with comparative opener) Uttered with a relatively wide opening of the articulating organs; said of vowels.
   • 1959, Anthony Burgess, Beds in the East (The Malayan Trilogy), published 1972, page 421:

     "Supposing somebody sees you, with all those flowers too? Supposing somebody writes him a letter? Ooooh!" (a pure round open Tamil O.)

10. (phonetics) Uttered, as a consonant, with the oral passage simply narrowed without closure.
11. (computing, used before "code") Source code of a computer program that is not within the text of a macro being generated.(Can we add an example for this sense?)
12. (of a multi-word compound) 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.
13. (especially sports) Of a club, bat or other hitting implement, angled upwards and/or (for a right-hander) clockwise of straight.