noun
oldest
OHL-duhst
noun
1
The person or thing that has existed longest among a group, especially the eldest child in a family.
"As the oldest, she always looked after her younger brothers."
How to Use Oldest
Learner’s notesIn plain EnglishThe one who has been around longest — most often used for the firstborn child in a family.
Common pairings
the oldest of three
oldest child
oldest sibling
Word Forms
oldests plural
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As the _____, she always looked after her younger brothers.