Other forms: firstborns
The firstborn is the eldest child of a family. Their firstborn, the firstborn son, firstborn rights.
The word carries weight because of inheritance: primogeniture, the rule that the eldest inherits everything, shaped European property and titles for a thousand years and still governs some of them. In the Bible the firstborn has a distinct status. In ordinary modern use, firstborn is simply the eldest, and birth-order research on whether it matters is far less conclusive than the popular version suggests.
1nounfirstbornThe eldest child of a family.
“Their firstborn was a boy, followed two years later by twin girls.”
firstborn is an eldest child.
The word is first plus born, a plain English compound used to translate a Hebrew and Greek term in the Bible. Its whole weight in English comes from that translation rather than from the language itself.
Middle English
first borne
English, today
firstborn
From Middle English first borne. by surface analysis, en + first + born.
Etymology from Wiktionary, CC BY-SA