The Canadian Style
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Chapitres
- - Close Abbreviations
- Introduction to Abbreviations
- General guidelines and observations
- Periods
- Plurals
- Capital letters and hyphens
- Titles used with personal names
- Military abbreviations
- University degrees, professional designations, military decorations, honours, awards and memberships
- Geographical names
- Addresses: streets and buildings; points of the compass
- Latitude and longitude
- Parts of a book or document
- Latin terms
- Scientific and technical terms
- Corporate names
- Acronyms and initialisms
- Number and percentage symbols
- Ampersand
- Monetary units
- Months and days
- Time of day and elapsed time
- Time zones
- The International System of Units (SI)
- The imperial system
- Business terms, expressions and symbols
- + Hyphenation: Compounding and Word Division
- + Spelling
- + Capitalization
- + Numerical Expressions
- + Italics
- + Punctuation
- + Quotations and Quotation Marks
- + Reference Matter
- + Letters and Memorandums
- + Reports and Minutes
- + Usage
- + Plain Language
- + Elimination of Stereotyping in Written Communications
- + Geographical Names
- + Revision and Proofreading
- + French Typographical Rules
- - Close Abbreviations
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1.04 Plurals
Add an s, but not an apostrophe, to form the plural of most abbreviations:
- ADMs
- BMWs
- CAs
- CRs
- FTEs
- GICs
- MPs
- PCBs
- 747s
Use an apostrophe and s to form the plural of numerical names of aircraft ending in a single letter:
- 727-100C’s
- 747B’s
- Cessna 402B’s
In cases where the resulting form would be ambiguous, add an apostrophe before the s:
- c.o.d.’s
- Q’s and A’s
- SIN’s
Add an apostrophe and s to form the plural of abbreviations containing more than one period, and an s without an apostrophe, to form the plural of abbreviations with only one period. In the latter case, the s precedes the period:
- G.M.’s
- Gens.
- pts.
The plurals of Mr. and Mrs. are irregular:
- Mr.
- Messrs.
- Mrs.
- Mmes.
The plural forms of the abbreviations for certain bibliographic references are different:
- l. (line)
- ll. (lines)
- p. (page)
- pp. (pages)
- f. (and the one following)
- ff. (and those following)
- c., ch. (chapter)
- c., ch. (chapters)
- MS (manuscript)
- MSS (manuscripts)
- s. (section)
- ss. (sections)
- subs. (subsection)
- subss. (subsections)
Note that SI/metric symbols maintain the same form for both singular and plural and are written without periods, except at the end of a sentence:
- 1 cm
- 5 cm
- 75 kg
- The boxer weighed only 75 kg.
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