Dictionary.com
definitions

nat.

  1. national.
  2. native.
  3. natural.
  4. naturalist.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for nat.

nat.

abbreviation for
  1. national
  2. natural
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