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  • O - style guide illustrations

    OAPs, old age pensioners

    do not use: they are pensioners or old people; do not use elderly to describe someone under 70
  • obbligato

    not obligato
  • O'Brian, Patrick

    author of Master and Commander
  • obscenities

  • obtuse

    "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

  • 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
  • OECD

    Organisation for Economic Cooperation and Development at first mention
  • oedipal complex

    the female equivalent is the electra complex
  • Ofcom

    Office of Communications, call it the broadcasting and telecommunications regulator or something similar
  • Offa

    Office for Fair Access (to higher education)
  • Offa

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

  • oil painting

  • oil production platform

    for production of oil
  • oil rig

    for exploration and drilling
  • oilseed rape

  • OK

    is OK; okay is not
  • old Labour

    but New Labour
  • Old Testament

  • O-levels

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

    or just Olympics or the games
  • omelette

  • one

    one should find an alternative unless one is mocking one's royal family; pref. you
  • 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

    prefer continuous or continual
  • 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 move the "only" in I Only Have Eyes for You when discussing the greatest songs of all time (the Flamingos' version was ranked 157th by Rolling Stone)
  • 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

    music style
  • Opec

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

  • ophthalmic

  • opossum

  • opposition, the

  • or

    Do not use "or" 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"
  • ordinance

    direction, decree
  • Ordnance Survey

    Britain's national mapping agency ("ordnance" because such work was originally undertaken by the army)
  • Orkney

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

    bookshop taken over by Waterstone's
  • O2, the

    (cap O, not the number 0) is the new name for 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)
  • Ouija

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

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

  • outpatient, inpatient

    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
  • outre

    no accent
  • outside

    not "outside of"
  • outward bound

    use a safer term such as outdoor adventure or adventure training: 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

    take care that you don't mean underestimate or understate (we often get this wrong)
  • overreact, override, overrule

    and most other words with the prefix "over" do not need a hyphen
  • 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, "darkness visible" (Paradise Lost), "the living dead" (The Waste Land); one of Margaret Atwood's characters thought "interesting Canadian" was an oxymoron
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