The functions the hyphen appear to be straightforward, but exceptions and
inconsistencies abound. This post serves as a guide to the recommendations of
The
Chicago Manual of Style regarding hyphenation.
Hyphens are often introduced when new noun compounds are created, including
in technological vocabulary, but such terms usually become closed compounds,
though there are exceptions, such as
mind-set and
light-year.
Other exceptions include constructions with certain first or second elements,
such as in the case of
self-respect and
president-elect, and
noun combinations such as
city-state and
writer-director.
Some terms that include letters linked to nouns retain hyphenation (
A-list,
T-bone,
X-axis). Omission of a hyphen in
email is
trending, but similar terms such as
e-commerce resist this evolution.
Some prefixes take hyphens (
anti-inflammatory, “non-Hodgkin’s
lymphoma,” and nouns preceded by
ex, such as
ex-partner),
though most prefixes do not require them. Hyphens also represent expression, in
isolation, of a prefix or a word element (
pre-,
-er) when
construction of a word using that prefix would otherwise not require a hyphen.
Another use of hyphens is with words to be distinguished from nonhyphenated
homographs (
co-op,
re-creation).
Other special cases for hyphenation with nouns include relationship terms
preceded by
great (
great-grandmother) and
in-law as
well as combinations using
in-law (
sister-in-law), some compound
nouns beginning with
vice (
vice-consul), constructions ending
in
odd (
hundred-odd), and terms for compound nationalities
where the first element is altered to end in
o (
Anglo-American),
but not others that are no so altered (
Italian American).
Hyphens link some double and even triple and quadruple surnames (“Lobelia
Sackville-Baggins”), though not all double-, triple-, or quadruple-barreled
surnames, as they are also called, are hyphenated (“Sacha Baron Cohen”). They
also sometimes connect double first names, as in “Jean-Paul,” although this
usage is rare in English names. Some company and product names use hyphens
(Bristol-Meyers Squibb, EZ-Kleen).
Hyphens are employed in spelled-out numerical terms representing different
place values (
twenty-four), in fractions (as in
one-third),
and in number sequences, such as phone numbers and Social Security numbers, and
number groupings, such as dates styled entirely in numerals.
One of the most common uses of hyphens is in words in phrasal adjectives
preceding but not following a noun (“short-term investment,” “off-the-cuff
remark”) and when combining similar-looking constructions that begin with
comparative adverbs such as
better,
much, and
well
(“best-kept secret”).
Some style manuals (but not this site) recommend that phrasal adjectives be
hyphenated regardless of their position, and a few such expressions (such as
far-reaching)
are always hyphenated regardless of position or style authority. Also, a letter
space should never intervene when a hyphen connects two words or numbers,
except when suspending the first use of a word common to two or more phrasal
adjectives (“fifteen- and thirty-day increments”).
If a hyphenation links one word with an open compound, use an en dash rather
than a comma to clarify that the symbol links the word to the entire compound,
not just the element of the compound adjacent to the symbol: “pre–ice age
migration,” “post–World War I recovery,” “mountain lodge–style ambience,”
“Stephen Curry–level ball handling.” (The rule does not apply to abbreviations
standing for open compounds, so use a hyphen, for example, in “US-Mexico
border.”) If a compound is already hyphenated, use an additional hyphen to
connect a word or prefix, as in “non-English-speaking actors” (extending from
“English-speaking actors”).
When are hyphens used erroneously? When adverbs ending in
-ly are
mistakenly attached to the words that follow (as in “richly-detailed design”)
and when adjectives are wrongly hyphenated to nouns (“near-term”). And although
verb phrases are often hyphenated (
test-drive), those words, as used
in “I’m taking it for a test drive,” do not constitute a verb phrase.
When in doubt about whether to insert or omit a hyphen, consult a dictionary
or a style manual, or check a publication’s or organization’s house style guide
if you are writing for one.
Hyphens are also employed to break a word across two lines of type. Such
breaks should occur between syllables, as demonstrated in a dictionary, but
many publications choose to avoid this use of hyphens for aesthetic and
practical reasons. If they are employed, it is recommended that type be
adjusted so that no more than two end-of-line hyphens appear in a row and that
they not be used at the end of the last line of a column or a page. (In
addition, words that already include a hyphen should not be broken across two
lines of type except at the existing hyphen.) Also, they are not advised for
headlines and other large-type elements.
An issue related to hyphenation is capitalization of hyphenated terms in headlines
and titles. Capitalize the following elements according to the recommendations
of
The Chicago Manual of Style:
• the first element
• subsequent elements except for articles; prepositions; coordinating
conjunctions (
and,
but,
for, nor, and
or);
and
flat,
sharp, and the like following letters denoting
musical keys and chords
• the second element if it is a proper noun or proper adjective following a
prefix or similar form that does not stand by itself as a word (
Anti-,
Pre-, and so on)
• the second element in a hyphenated spelled-out number (
Fifty-One,
Twenty-Fifth,
and so on) or hyphenated simple fraction (“Two-Thirds Vote”).
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