BCabbr.1. Bachelor of Chemistry2. or bc before Christ3. British Columbia4. buoyancy compensatorAmerican Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.BC abbreviation for 1. Also: B.C. (indicating years numbered back from the supposed year of the birth of Christ) before Christ: in 54 bc Caesar came. Compare AD 2. (Placename) British Columbia Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014BC British Columbia. B.C. or BC, 1. before Christ (used in indicating dates). 2. British Columbia. usage: See A.D. Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.BCBecauseDictionary of Unfamiliar Words by Diagram Group Copyright © 2008 by Diagram Visual Information Limited