eldest

American  

[el-dist] / ˈɛl dɪst /

adjective

1. oldest; firstborn; of greatest age: eldest sister;

   eldest brother;

   eldest sister;

   eldest born.

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eldest British  

/ ˈɛldɪst /

adjective

1. being the oldest, esp the oldest surviving child of the same parents

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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."

Related Words

• earlier