The easiest way to determine whether to hyphenate or where to break a word is to look it up in the dictionary. Avoid breaking words in a publication-move to the next line whenever possible. Refer to the Chicago Manual's Table 6.1, "A Spelling Guide for Compound Words," for more examples. Do not hyphenate compounds preceding or following a noun where the hyphen would be placed after a word ending in ly: highly regarded scholar; ridiculously long commute; unreasonably difficult take-home exam
Hyphenate phrases used as adjectives before a noun.
When a numbers and units of measurement are used adjectivally, they should be hyphenated:
All, fold, half, like, self, wide, multi
Hyphenate compounds that use all whether they precede or follow the noun.
Adjectival compounds with fold are spelled solid, unless they are formed with figures.
Hyphenate half compounds whether they precede or follow the noun.
Any like words can be spelled solid.
Self words should be hyphenated.
Use a hyphen with all proper nouns and wide:
Multi words are spelled solid unless such a spelling makes for awkward reading.
Words formed with the prefix co should be hyphenated. This is University style. Using a hyphen between the co and the root word makes the word more readable and prevents confusion. Exceptions: coed, coeducational, cooperate.
Compounds preceding a noun
Compounds with well-, ill-, better-, best-, high-, little-, lesser-, low-, etc., are hyphenated when they precede the noun unless the expression carries a modifier: well-known man; he is well known; high-quality work; very high quality work.
Hyphenate grade-point. Avoid abbreviating this, but if you must, use GPA-all caps, no periods.
A general rule is that hyphens link items and dashes separate items.
A hyphen joins words to form compound adjectives or is used to attach certain prefixes or suffixes to words.
The dash that is usually typed as two hyphens (--) is typeset as an em dash (-). It indicates a break in thought and can be used within a sentence to insert a parenthetical phrase. Neither a double hyphen nor an em dash should have spaces on either side.
The en dash (-) is used between ranges of numbers or dates, or between adjectival phrases containing two-word concepts (1984-87; pp. 123-34; New York-Dallas flight). En dashes do not have spaces on either side. Do not use an en dash to replace a hyphen.
If you need a detailed description, see the Chicago Manual.
One word or two? Hyphens or not?
Off campus, On campus
As adverb, no hyphens; as adjective, hyphens.
Note: Marywood University's Off Campus Degree Program, a specific program, is always capitalized and is never hyphenated. The abbreviation is OCDP.
No hyphen is used after semi unless it is connected to a word beginning with i.
No hyphen. This is University style.