ill—Compounds formed with ill are hyphenated before a noun, open after a noun: ill-fitting garment, the garment was ill fitting, ill-advised decision, the decision was ill advised.
impact—a noun, not a verb.
Inc., Co., etc.—Usually eliminated in running text; when included, do not set off a with a comma: Curtis Screw Co., Moog Inc.
include—Use include when what follows is only part of the total: The price includes breakfast. The zoo includes hippopotamuses and rhinoceroses.
initials—When two or more initials are used before a name, use periods and insert a space between each: H. W. Fowler, W. E. B. Du Bois. No periods or spaces are used for people commonly referred to by their initials only: FDR, JFK, LBJ, MLK.
inter- (prefix)—Generally closed, no hyphen: interrelated, intercontinental, intergenerational. (See prefixes and suffixes.)
intra- (prefix)—Generally closed, no hyphen: intranet, intracranial. (See prefixes and suffixes.)
italicized words—When italicized words that are singular in form are used in the plural, set the s or es in roman type: “She bought two Chicago Tribunes and three Milwaukee Journals.” (11) (See titles, composition and punctuation)
italics or quotation marks? See titles, composition, this section.
Jr., Sr., II, IV, etc.—Do not set off with commas: Martin Luther King Jr., Loudon Wainwright III, Benjamin O. Davis Sr.
judgment (not judgement)
The Juilliard School (not Julliard)
kick off (v.), kickoff (n., adj.): The event will kick off the week. The event is a kickoff to the week’s activities. The kickoff event went smoothly.
Kleinhans Music Hall
(11) Chicago Manual of Style, 14th edition (1993), 6.14
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