Should e.g. and i.e. have periods, e.g. "e.g.", or no periods, eg "eg"? Should they be italicized, e.g. "i.e." or not, eg "i.e"?
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In formal contexts, I would go with "e.g." and "i.e.", with two periods and without a whitespace. The spellings without periods are quite popular, but informal. For example, Merriam-Webster does not have an entry for either "eg" or "ie". Wiktionary marks "eg." and "eg" as informal, and offers the following usage notes:
It also offers the following usage notes for "i.e.":
Personally, I would argue that there's no need whatsoever to italicize "e.g." or "i.e.". Both expressions are extremely common in English, and have been for a long time. They are full-fledged citizens of the English language, and as such, they do not have to be italicized as if they were foreign words.
Most style guides I have seen also say no italics for e.g. or i.e. — they are common Latin abbreviations.
protected by tchrist Mar 1 '15 at 19:04
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