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Take the example "one-second interval". Is there a dash between "one" and "second"? Also, should second be plural if I say "three-second/s interval"?

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    John Lawler's answer mentioning the eleven-year-old boy rule answers this.
    – Andrew Leach
    Mar 11, 2014 at 14:48
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    BTW, maybe it should be called a hyphen, not a dash.
    – Stan
    Mar 11, 2014 at 14:51

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