tad (t?d)n. Informal 1. A small amount or degree; a bit.2. A small boy.Idiom: a tad To a small degree; somewhat: acting a tad silly; a tad uncomfortable.[Perhaps short for tadpole.]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.tad (tæd) n1. US and Canadian a small boy; lad2. US and Canadian a small bit or piece3. a tad a little; rather: she may be a tad short but she got a top modelling job. [C20: short for tadpole]Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014tad (tæd) n. Informal. 1. a small child, esp. a boy. 2. a small amount or degree; bit: Move a tad to the right. I’ll add a tad more vanilla. [1875?80, Amer.; perhaps shortening of tadpole] Random House Kernerman Webster’s College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.