Thirdborn

adj, noun

adj, noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    The third child born to a parent or family.

    "After correcting for factors that may affect scores, including parents’ education level, maternal age at birth and family size, the researchers found that eldest children scored an average of 103.2, about 3 percent higher than second children (100.3) and 4 percent higher than thirdborns (99.0)."

Adjective
  1. 1
    Born as the third child to parent or family. not-comparable

    "Mary, the thirdborn Bennett child in the novel Pride and Prejudice, receives the least attention."

  2. 2
    Third of a particular type to be born to a parent or family. not-comparable

    "Prince Arthur was Queen Victoria's thirdborn son and her seventh child overall."

Example

More examples

"Mary, the thirdborn Bennett child in the novel Pride and Prejudice, receives the least attention."

Etymology

From third + born.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.