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The Economist Style Guide, 10th Edition by The Economist

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Spelling

Some words are spelt differently in American English and British English. The spellings are sufficiently similar to identify the word, but the unfamiliar form may still disturb the reader. If writing for an international audience, it may be better to use a synonym than to take this risk, although sometimes it cannot be avoided.

American English is more obviously phonetic than British English. The word cosy becomes cozy, aesthetic becomes esthetic, sizeable becomes sizable, arbour becomes arbor, theatre becomes theater.

Main spelling differences

-ae/-oe Although it is now common in British English to write medieval rather than mediaeval, other words – often scientific terms such as aeon, diarrhoea, anaesthetic, gynaecology, homoeopathy ...

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