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Section 5: Abbreviations. CONTENTS PART 1. Grammar, Usage, and Style SECTION 1. Punctuation: Major Marks SECTION 2. Punctuation: Other Marks SECTION 3. Capitalization SECTION 4. Numbers SECTION 5. Abbreviations SECTION 6. Plurals and Possessives SECTION 7. Spelling
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CONTENTS • PART 1. Grammar, Usage, and Style • SECTION 1.Punctuation: Major Marks • SECTION 2.Punctuation: Other Marks • SECTION 3.Capitalization • SECTION 4.Numbers • SECTION 5.Abbreviations • SECTION 6.Plurals and Possessives • SECTION 7.Spelling • SECTION 8.Compound Words • SECTION 9.Word Division • SECTION 10.Grammar • SECTION 11.Usage
ABBREVIATIONS ¶502a. Avoid using abbreviations except on business forms, in catalogs, in tables, and in informal documents shared with your colleagues. When in doubt, spell it out.
ABBREVIATIONS ¶502b. Some abbreviations are always acceptable, such as those that accompany a person’s name. Mr. Ms. Jr. M.D. Esq. Mrs. Sr. Ph.D.
ABBREVIATIONS ¶502b. Some abbreviations are always acceptable, such as those that are part of an organization’s name. Co. Corp. Inc. Ltd.
ABBREVIATIONS ¶502c. Some abbreviations are always acceptable, such as those used in place of a long organizational name. NAACP SEC IRS NBC
ABBREVIATIONS ¶502b. Some abbreviations are always acceptable, such as those used in expressions of time. a.m. p.m. PST EDT
ABBREVIATIONS ¶503. When alternative forms are available, use the form that is the shortest without any sacrifice of clarity. cont. (rather than contd.) 2 lb (rather than 2 lbs) Enc. 2 (rather than Encs. 2 or Encl. 2) 2d (rather than 2nd)
ABBREVIATIONS—PUNCTUATION ¶506. As a rule, use a period after the abbreviation of a single word. Mrs. Corp. pp. Wed. Jr. Inc. Nos. Dec.
ABBREVIATIONS— PUNCTUATION AND SPACING ¶507. When a lowercase abbreviation consists of single initials representing two or more words, insert a period after each initial but insert no space after each internal period. a.m. i.e. BUT: rpm p.m. e.g. mph
ABBREVIATIONS— PUNCTUATION AND SPACING ¶508. As a general rule, do not use periods in all-cap abbreviations consisting of single initials representing two or more words. CBS CEO ASAP MIT FYI CD-ROM
ABBREVIATIONS— PUNCTUATION AND SPACING ¶¶508, 519a, 528a. As an exception to the general rule, insert periods in all-cap abbreviations when they consist of single initials and they represent: Geographic names: U.S. N.J. D.C. Academic degrees: B.A. M.S. M.D. Miscellaneous expressions: A.D. B.C. P.O.
ABBREVIATIONS— PUNCTUATION AND SPACING ¶¶509, 519a, 535a. When an abbreviation consists of more than single initials, insert a period and a space after each element in the abbreviation. N. Mex. Lt. Col. Rt. Rev. loc. cit. EXCEPTIONS: Academic abbreviations: Ph.D. LL.B. Units of measurement: sq ft cu cm
ABBREVIATIONS—PUNCTUATION ¶510. Do not use a period after shortened forms of words. deli temp hype demo typo condo fax info co-op
ABBREVIATIONS— PUNCTUATION AND SPACING ¶516a. Insert a period and a space after each initial in a person’s name. M. A. Devine F. E. Hollings W. E. B. Du Bois B. J. Malone
ABBREVIATIONS—PUNCTUATION ¶516b. As a rule, omit periods when a person’s name is expressed entirely in initials. JFK FDR
ABBREVIATIONS—PUNCTUATION ¶522a. Do not use periods in acronyms (all-cap initials that are pronounced like a word). PIN BOGSAT NIMBY MEGO WOMBAT PEBCAK