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This table provides some comon abbreviations and their meanings. Notice that many abbreviations only differ by a capitalization or punctuation, which can be perplexing! This table willl ensure you will no longer confuse GMT (Greenwich mean time) with GDP (gross national product), or SEC (Securities Exchange Commission) with sec (seconds). And be sure to check out our guide to state abbreviations so you can finally determine whether MO stands for Montana or Missouri!

A.B. Artium Baccalaureus [Bachelor of Arts] abbr. abbreviation(s), abbreviated Acad. Academy A.D. anno Domini [in the year of the Lord] alt. altitude A.M. ante meridiem [before noon]; Artium Magister [Master of Arts] AM amplitude modulation Assn. Association at. no. atomic number at. wt. atomic weight Aug. August Ave. Avenue AWOL absent without leave b. born, born in B.A. Bachelor of Arts B.C. Before Christ b.p. boiling point B.S. Bachelor of Science Btu British thermal unit(s) C Celsius (centigrade) c. circa [about] cal calorie(s) Capt. Captain cent. century, centuries cm centimeter(s) co. county Col. Colonel; Colossians Comdr. Commander Corp. Corporation Cpl. Corporal cu cubic d. died, died in D.C. District of Columbia Dec. December dept. department dist. district div. division Dr. doctor E east, eastern ed. edited, edition, editor(s) est. established; estimated et al. et alii [and others] F Fahrenheit Feb. February fl. floruit [flourished] fl oz fluid ounce(s) FM frequency modulation ft foot, feet gal. gallon(s) Gen. General, Genesis GMT Greenwich mean time GNP gross national product GOP Grand Old Party (Republican Party) Gov. governor grad. graduated, graduated at H hour(s) Hon. the Honorable hr hour(s) i.e. id est [that is] in. inch(es) inc. incorporated Inst. Institute, Institution IRA Irish Republican Army IRS Internal Revenue Service Jan. January Jr. Junior K Kelvin kg kilogram(s) km kilometer(s) £ libra [pound], librae [pounds] lat. latitude lb libra [pound], librae [pounds] Lib. Library long. longitude Lt. Lieutenant Ltd. Limited m meter(s) M minute(s) M.D. Medicinae Doctor [Doctor of Medicine] mg milligram(s) mi mile(s) min minute(s) mm millimeter(s) mph miles per hour Mr. Mister (always abbreviated) Mrs. Mistress (always abbreviated) Msgr Monsignor mt. Mount, Mountain mts. mountains Mus. Museum N north; Newton(s) NAACP National Association for the Advancement of Colored People NASA National Aeronautics and Space Administration NATO North Atlantic Treaty Organization NE northeast no. number Nov. November OAS Organization of American States Oct. October Op. Opus [work] oz ounce(s) pl. plural pop. population pseud. pseudonym pt. part(s) pt pint(s) pub. published; publisher qt quart(s) Rev. Revelation; the Reverend rev. revised R.N. registered nurse rpm revolution(s) per minute RR railroad S south S second(s) SEATO Southeast Asia Treaty Organization SEC Securities and Exchange Commission sec second(s); secant Sept. September Ser. Series Sgt. Sergeant sq square Sr. Senior SSR Soviet Socialist Republic St. Saint; Street UNICEF United Nations Children’s Fund uninc. unincorporated Univ. University U.S. United States USA United States Army USAF United States Air Force USCG United States Coast Guard USMC United States Marine Corps USN United States Navy USSR Union of Soviet Socialist Republics VFW Veterans of Foreign Wars VISTA Volunteers in Service to America vol. volume(s) vs. versus W west; watt(s) WHO World Health Organization wt. weight yd yard(s) YMCA Young Men’s Christian Association YWCA Young Women’s Christian Association

Writing & Language

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Summer Games Gold Medal Winners: Track and Field–Men: Men’s Olympic Long Jump Through the Years

  • Summer Games Gold Medal Winners: Track and Field–Men: Men’s Olympic Long Jump Through the Years

TrendingHere are the facts and trivia that people are buzzing about.

Did Birds Evolve from Dinosaurs?

The Twelve Dancing Princesses

Current Events This Week: January 2023

African Americans by the Numbers

Andersen’s Fairy Tales: Contents

The Celtic Twilight: A Teller of Tales

TrendingHere are the facts and trivia that people are buzzing about.

Did Birds Evolve from Dinosaurs?

The Twelve Dancing Princesses

Current Events This Week: January 2023

African Americans by the Numbers

Andersen’s Fairy Tales: Contents

The Celtic Twilight: A Teller of Tales

  • Did Birds Evolve from Dinosaurs?
  • The Twelve Dancing Princesses
  • Current Events This Week: January 2023
  • African Americans by the Numbers
  • Andersen’s Fairy Tales: Contents
  • The Celtic Twilight: A Teller of Tales