The Wayback Machine - https://web.archive.org/web/20131109084838/http://www.theguardian.com/styleguide/o
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  • O - style guide illustrations

    OAPs, old age pensioners

    Do not use: they are pensioners or old people; do not use old or elderly to describe someone under 75 (the editors reserve the right to increase this upper limit, as appropriate)
  • obbligato

    not obligato
  • Obiang

    Teodoro Obiang Nguema Mbasogo, president of Equatorial Guinea since 1979; Obiang on second mention
  • obliged

    not "obligated"
  • O'Brian, Patrick

    author of Master and Commander
  • obtuse

    means "mentally slow or emotionally insensitive" (Collins); often confused with abstruse (hard to understand) or obscure
  • Occam's razor

    philosophical principle, attributed to the 14th-century English friar William of Ockham, that broadly means prefer the simplest explanation, adopting the one that makes the fewest assumptions and "shaving away" the rest
  • occupied territories

    Gaza and the West Bank
  • occurred

    two Rs
  • Oceania

    a preferable term to Australasia, it is sometimes divided into Near Oceania and Remote Oceania, and comprises, according to the UN:

    Australia/New Zealand

    Melanesia
    (Fiji, New Caledonia, Papua New Guinea, Solomon Islands, Vanuatu)

    Micronesia (Guam, Kiribati, Marshall Islands, Federated States of Micronesia, Nauru, Northern Mariana Islands, Palau)

    Polynesia (American Samoa, Cook Islands, French Polynesia, Niue, Pitcairn, Samoa, Tokelau, Tonga, Tuvalu, Wallis and Futuna Islands)
  • oceans, seas

    capped up, eg Atlantic Ocean, Red Sea
  • octopus, platypus

    plural octopuses, platypuses, not the cod Latin octopi, platypi
  • Odisha

    Indian state formerly known as Orissa
  • OECD

    Organisation for Economic Co-operation and Development at first mention
  • oedipal complex

    the female equivalent is electra complex
  • Ofcom

    Office of Communications – the broadcasting and telecommunications regulator
  • Offa

    eighth-century king of Mercia, best known for Offa's Dyke, a giant earthwork that separated the kingdom from Powys
  • Offa

    Office for Fair Access (to higher education)
  • offbeat, offhand, offside

  • Office for National Statistics

    ONS on second mention
  • Office of Fair Trading

    OFT on second mention
  • Office of the Deputy Prime Minister

    replaced in May 2006 by the Department for Communities and Local Government, which dropped the "Department for" a year later
    See departments of state
  • off-licence

  • Ofgem

    regulates the gas and electricity markets in Britain
  • Ofsted

    Office for Standards in Education, but normally no need to spell out
  • Ofwat

    regulates the water and sewerage industry in England and Wales
  • Oh

    not O except in phrases of invocation or hymn titles, eg O God, Our Help in Ages Past
  • oilfield, oilwell

  • oil painting

  • oil production platform

    for production of oil
  • oil rig

    for exploration and drilling
  • oilseed rape

  • OK

    is OK; okay is not
  • Old Etonian

  • old Labour

    but New Labour
  • old master

    lowercase for paintings as well as ageing schoolteachers
  • Old Testament

  • olé!

    needs the accent to stop it reading like "ole"
  • O-levels

    GCE O-levels and CSEs were combined in 1986 to become GCSEs
  • Olympic Games

    or just Olympics, or the Games
  • omelette

    not omelet
  • omertà

    code of silence; note accent
  • on board

    rather than aboard, except in the phrase "All aboard!"
  • one

    one should find an alternative, preferably you (unless one is making fun of one's royal family)
  • one another

    if more than two; each other two only
  • one in six, one in 10

    etc should be treated as plural. There are good grammatical and logical reasons for this. Compare "more than one in six Japanese is 65 or older … " with "more than one in six Japanese are 65 or older … "

    Grammatically, we are talking not about the noun "one" but the noun phrase "one in six", signifying a group of people. Logically, the phrase represents a proportion – just like "17%" or "one-sixth", both of which take plural verbs. "Two out of every seven" and "three out of 10" take plurals too, functioning identically.

    "One in six is … " is also unnecessarily (and possibly misleadingly) specific, implying that of any six people from the group you take, exactly one will be as described. "One in six" means one-sixth on average over the whole group, and a plural verb better reflects this. We wouldn't say "Only 1% of Republican voters is able to point to Iraq on a map" just because there's a "one" in there
  • one nation Tory

  • Onetel

    UK telecom company, not One.Tel, which is Australian
  • ongoing

    jargon word that can normally be removed without making any difference to the story; if you need to, replace with continuous or continuing
  • online

  • only

    can be ambiguous if not placed next to the word or phrase modified: "I have only one ambition" is clearer than "I only have one ambition"; however, be sensible: do not change the song title to I Have Eyes for Only You.

    Say "the only" or "one of the few" rather than "one of the only", which has found its way into the paper
  • on side or onside?

    The referee kept the home crowd on side by ruling the goal onside
  • on to

    not onto

    Kingsley Amis, perhaps slightly overstating the case for this, argued: "I have found by experience that no one persistently using onto writes anything much worth reading"
    See into
  • Op 58, No 2

    for classical music
  • Opec

    Organisation of the Petroleum Exporting Countries, but not necessary to spell out
  • opencast mine

  • ophthalmic

  • opossum

  • opposition, the

  • or

    need not be used when explaining or amplifying – rather than "the NUT, or National Union of Teachers" say "the NUT (National Union of Teachers)" or, even better, "the National Union of Teachers" at first mention and then just "the NUT" or "the union"
  • orangutan

    one word
  • ordinance

    decree
  • Ordnance Survey

    Britain's national mapping agency (ordnance because such work was originally undertaken by the army)
  • oriented, disoriented

    not orientated, disorientated
  • Orkney

    not "the Orkney Isles" or "the Orkneys"
  • Ottakar's

    bookshop taken over by Waterstones
  • O2, the

    (cap O, not the number 0) is the name of the former Millennium Dome
  • Ötzi the Iceman

    Europe's oldest natural human mummy (dated to about 3300BC), found in the Alps in 1991
  • Ouija

    TM; the generic name most commonly used, though not very satisfactory, is "talking board"
  • outback

    (Australia)
  • outed, outing

    take care with these terms: if we say, for example, that a paedophile was outed, we are equating that with a gay person being outed; use exposed or revealed instead
  • outgrow, outgun, outmanoeuvre

  • outpatient

    St Thomas' hospital in south London boasts the following styles, all on signs within a few yards of each other: Out Patients, Out-Patients, Outpatients, and outpatients. Across London, Barts adds Out-patients and OUTPATIENTS to the eclectic mix.
    In a further development, the NHS has all but eradicated the apostrophe
  • outre

    no accent
  • outside

    not "outside of"
  • outward bound

    outdoor adventure or adventure training are safer terms: we have been sued twice for reporting that people have died on "outward bound" courses that were nothing to do with the Outward Bound Trust
  • over

    not overly
  • overestimate, overstate

    are frequently confused with underestimate or understate
  • overreact, override, overrule

    and most other words with the prefix "over" do not need a hyphen
  • oxen

    not oxes is the plural of ox
  • Oxford comma

    a comma before the final "and" in lists: straightforward ones (he ate ham, eggs and chips) do not need one, but sometimes it can help the reader (he ate cereal, kippers, bacon, eggs, toast and marmalade, and tea), and sometimes it is essential:

    compare
    I dedicate this book to my parents, Martin Amis, and JK Rowling

    with
    I dedicate this book to my parents, Martin Amis and JK Rowling
  • oxymoron

    does not just vaguely mean self-contradictory; an oxymoron is a figure of speech in which apparently contradictory terms are used in conjunction, such as bittersweet, compassionate conservatism, "darkness visible" (Paradise Lost), "the living dead" (The Waste Land); one of Margaret Atwood's characters thought "interesting Canadian" was an oxymoron
  • Özil, Mesut

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