Oxford spelling (or Oxford English Dictionary spelling) is the spelling used by Oxford University Press (OUP), including in its Oxford English Dictionary (OED), and other publishers who are "etymology conscious", according to Merriam-Webster. Apart from OUP, British dictionary publishers that use it include Cassell, Collins, and Longman. In digital documents it may be indicated by the language tag en-GB-oed.
Oxford spelling can be recognized by its use of the suffix ‑ize instead of -ise: organization, privatize and recognizable instead of organisation, privatise and recognisable. The spelling affects about 200 verbs, and is favoured on etymological grounds, in that -ize corresponds more closely to the Greek root, -izo, of most -ize verbs. The suffix -ize has been in use in the UK since the 15th century, and is the spelling variation used in American English. The belief that -ize is an exclusively American variant is incorrect. The OED lists the -ise form of words separately, as "a frequent spelling of -IZE...". The OED explains its use of -ize as follows:
In mod.F. the suffix has become -iser, alike in words from Greek, as baptiser, évangéliser, organiser, and those formed after them from L., as civiliser, cicatriser, humaniser. Hence, some have used the spelling -ise in Eng., as in French, for all these words, and some prefer -ise in words formed in French or Eng. from L. elements, retaining -ize for those of Gr. composition. But the suffix itself, whatever the element to which it is added, is in its origin the Gr. -ιζειν, L. -izāre; and, as the pronunciation is also with z, there is no reason why in English the special French spelling should be followed, in opposition to that which is at once etymological and phonetic. In this Dictionary the termination is uniformly written -ize. (In the Gr. -ιζ-, the i was short, so originally in L., but the double consonant z (= dz, ts) made the syllable long; when the z became a simple consonant, (-idz) became īz, whence Eng. (-aɪz).)
The use of -ize instead of -ise does not affect the spelling of words in British English that end in -yse, such as analyse, paralyse and catalyse, which come from the Greek verb λύω, lyo, not from an -izo verb.
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Oxford spelling is the official or de facto spelling standard used in style guides of the international organizations that belong to the United Nations System. For example, this includes the World Health Organization, the International Telecommunication Union, the International Labour Organization and UNESCO. UN treaties and declarations, such as the Universal Declaration of Human Rights. Other international organizations that adhere to this standard include the International Organization for Standardization (ISO), the World Trade Organization (WTO), the North Atlantic Treaty Organization (NATO), the International Atomic Energy Agency (IAEA), the Organization of the Petroleum Exporting Countries (OPEC), Interpol, the International Committee of the Red Cross, the World Wide Fund for Nature (WWF), Amnesty International, and the World Economic Forum.
Oxford spelling is also used in a number of academic publications. For example, the London-based scientific journal Nature uses it.
However, Oxford spelling is not necessarily followed by the staff of the University of Oxford. In 2011, 2012, and 2013, the university website has recommended the use of "s" rather than "z" spellings for its public relations material.
Several major newspapers and magazines in the UK use -ise rather than the Oxford-style -ize spellings. The Times had been using -ize until the early 1990s, when it decided to switch to the -ise spelling, although The Times Literary Supplement has continued to use Oxford spelling.
Language tag comparison:
The following table summarizes a few general spelling differences between the four major spelling systems. Note: en-GB simply stands for British English; it is not specified whether -ize or -ise should be used. The language tag en-GB-oed, however, requires the consistent use of -ize and -ization.
programme, program (computer code)
programme, program (computer code)
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