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Chapter 6.
6.35.
Unless usage demands otherwise, use a hyphen to join a prefix or combining form to a capitalized word. (The hyphen is retained in words of this class set in caps.)
- anti-American
- pro-British
- un-American
- non-Government
- neo-Nazi
- post-World War II or post-Second World War
- non-Federal
- but
- nongovernmental
- overanglicize
- transatlantic
Numerical compounds
6.36.
Print a hyphen between the elements of compound numbers from twenty-one to ninety-nine and in adjective compounds with a numerical first element.
- twenty-one
- twenty-first
- 6-footer
- 6-foot-ll-inch man
- 24-inch ruler
- 3-week vacation
- 8-hour day
- 10-minute delay
- 20th-century progress
- 3-to-l ratio
- 5-to-4vote
- .22-caliber cartridge
- 2-cent-per-pound tax
- four-in-hand tie
- three-and-twenty
- two-sided question
- multimillion-dollar fund
- 10-dollar-per-car tax
- thirty- (30-) day period
- but
- one hundred twenty-one
- 100-odd
- foursome
- threescore
- foursquare
- $20 million airfield
- second grade children
6.37.
Print without a hyphen a modifier consisting of a possessive noun preceded by a numeral. (See also rule 8.14.)
- 1 month's layoff
- 3 weeks' vacation
- 1 week's pay
- 1 minute's delay
- 2 hours' work
but a 1-minute delay
