[ ahy-zuhk ]

  1. a son of Abraham and Sarah, and father of Jacob. Genesis 21:1–4.

  2. a male given name: from a Hebrew word meaning “laughter.”

Words Nearby Isaac Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use Isaac in a sentence

British Dictionary definitions for Isaac


/ (ˈaɪzək) /

  1. an Old Testament patriarch, the son of Abraham and Sarah and father of Jacob and Esau (Genesis 17; 21–27)

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

Cultural definitions for Isaac


The son of Abraham and the father of Jacob and Esau.

Notes for Isaac

Abraham was prepared to sacrifice Isaac at God's request. (See Abraham and Isaac.)

The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.