Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
obsolete (in prescriptions, etc) ante prandium
Word Origin for a.p.
Latin: before a meal
son of: occurring as part of some surnames of Welsh originap Thomas
Word Origin for ap
from Welsh mab son
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
abbreviation of Associated Press, first recorded 1879; the organization was founded May 1848 as co-operative news gathering effort among New York City newspaper publishers covering the war with Mexico.
Online Etymology Dictionary, © 2010 Douglas Harper