Isaac

American  

[ahy-zuhk] / ˈaɪ zək /

noun

1. (in the Bible) a son of Abraham and Sarah, and the father of Jacob.

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

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Isaac British  

/ ˈaɪzək /

noun

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

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Isaac Cultural  

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

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Discover More

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

Compare meaning

How does isaac compare to similar and commonly confused words? Explore the most common comparisons:

• Ishmael vs. Isaac

Example Sentences

The hand-cranked coffee mill was replaced with horse-powered machinery, and Glidden and a partner, Isaac Ellwood, formed Barb Fence Co.

From The Wall Street Journal • Apr. 12, 2026

“It was definitely pretty impactful last night. The wind reports in the area saw gusts up to 35 to 40 mph yesterday during late afternoon,” said Isaac Longley, a meteorologist with AccuWeather.

From Los Angeles Times • Apr. 11, 2026

The father-son duo particularly enjoy group walks in the park, especially when Isaac can take his remote-control car along too.

From BBC • Apr. 10, 2026

Price cuts for VantageScore reports by credit bureaus led to Fair Isaac stock falling 26% since March 6.

From Barron's • Apr. 7, 2026

Finally, nearing the age of sixty, Isaac was given his freedom on February 21, 1834.

From "In the Shadow of Liberty" by Kenneth C. Davis