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Q. What is the difference in usage between an em dash and an en dash? A. I will try to condense the various bits of information scattered throughout CMOS. First of all, there are three lengths of what are all more or less dashes: hyphen (-), en dash (–), and em dash (—). I frame it this way because the work they do is roughly related to their length (though I don’t think CMOS puts it this way outright). The hyphen connects two things that are intimately related, usually words that function together as a single concept or work together as a joint modifier (e.g., tie-in, toll-free call, two-thirds). The en dash connects things that are related to each other by distance, as in the May–September issue of a magazine; it’s not a May-September issue, because June, July, and August are also ostensibly included in this range. And in fact en dashes specify any kind of range, which is why they properly appear in indexes when a range of pages is cited (e.g., 147–48). En dashes are also used to ...

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