- superlative of old.
eldest
Americanadjective
adjective
Etymology
Origin of eldest
First recorded before 900; Middle English; Old English eldesta, superlative of eald, ald; see old
Explanation
Someone who's described as eldest in their family was born first. Your eldest sister is the oldest one. Use the adjective eldest when you're describing people in terms of birth order: the oldest is the eldest. Your eldest friend is older than your other friends. You can also use the word as a noun, meaning "firstborn." Your mom might introduce you by saying, "This is my eldest." It's a somewhat formal, old fashioned word, much less popular today than "oldest."
Vocabulary lists containing eldest
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Arnault’s eldest son, Antoine, oversees LVMH’s communications and image, while Xavier Niel, the telecoms billionaire and longtime partner of Arnault’s daughter Delphine, is a shareholder in Le Monde.
From The Wall Street Journal ● Jul. 27, 2026
The Washington Post reported that Donald Trump Jr. and Eric Trump, the president’s eldest sons, have a portfolio of tech companies that are raking in billions from the Pentagon.
From Salon ● Jul. 26, 2026
Her youngest will receive some chapter books to help them transition into Year 3, while her eldest is moving to secondary school, and Dahlia has prepped suitable books to bridge that gap from primary.
From BBC ● Jul. 24, 2026
Katherine was the eldest of three children Short shared with his late wife, Nancy.
From MarketWatch ● Jul. 24, 2026
She then sought her eldest sister, who had undertaken to make enquiries on the same subject of Bingley.
From "Pride and Prejudice" by Jane Austen
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Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.