cir·cum·ci·sion (sûr?k?m-s?zh??n)n.1. The act of circumcising.2. A religious ceremony in which a boy or man is circumcised.3. Circumcision Christianity A feast observed on January 1 celebrating the circumcision of Jesus. Used with the.American 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.circumcision (?s??k?m?s???n) n1. (Surgery) a. surgical removal of the foreskin of malesb. surgical incision into the skin covering the clitoris in femalesc. removal of the clitoris2. (Judaism) the act of circumcision, performed as a religious rite by Jews and Muslims3. (Islam) the act of circumcision, performed as a religious rite by Jews and Muslims4. (Roman Catholic Church) RC Church the festival celebrated on Jan 1 in commemoration of the circumcision of JesusCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014cir?cum?ci?sion (?s?r k?m?s?? ?n) n. 1. a. the act of circumcising. b. brith. 2. (cap.) a church festival in honor of the circumcision of Jesus, observed on Jan. 1. [1125?75; Middle English