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Oahu

American

[oh-ah-hoo] / oʊˈɑ hu /

Or O'ahu

noun

an island in central Hawaii: third largest and most important island of the state; location of Honolulu. 589 sq. mi. (1,525 sq. km).

Oahu British

/ əʊˈɑːhuː /

noun

an island in central Hawaii: the third largest of the Hawaiian Islands. Chief town: Honolulu. Pop: 876 151 (2000). Area: 1574 sq km (608 sq miles)

"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

Example Sentences

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Oahu

Field trials were conducted on a residential road on the island of Oahu, Hawaii.

From Science Daily ● Jun. 28, 2026

Hawaiian Electric has told Oahu residents that they can expect to see higher electricity bills this month, followed by the Big Island and Maui in May and June.

From The Wall Street Journal ● Apr. 21, 2026

As floodwaters begin to recede on Oahu, residents are returning home to assess the damage and, in many cases, what’s been lost.

From Salon ● Mar. 22, 2026

By Tuesday evening, the Pacific Tsunami Warning Center said that waves several feet high were being recorded on the islands of Maui, Oahu and Hawaii, where the capital Honolulu is.

From BBC ● Jul. 30, 2025

He reached Honolulu in 1904, with a letter of introduction to a cousin who taught school on Oahu.

From "Farewell to Manzanar" by Jeanne Houston

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023