Dictionary.com
definitions

intro.

or introd

  1. introduce.
  2. introduced.
  3. introducing.
  4. introduction.
  5. introductory.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for intro.

intro.

introd.

abbreviation for
  1. introduction
  2. introductory
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