Dictionary.com
definitions

Seleucus I

noun
  1. Seleucus Nicator, 358?–281? b.c., Macedonian general under Alexander the Great: founder of the Seleucid dynasty.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for seleucus i

Seleucus I

noun
  1. surname Nicator. ?358–280 bc, Macedonian general under Alexander the Great, who founded the Seleucid kingdom
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