One-year-old

adj, noun

adj, noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    A child or animal that is one year of age.
Adjective
  1. 1
    Having lived or existed for one year. not-comparable

    "a one-year-old car"

Adjective
  1. 1
    one year of age wordnet

Synonyms

All synonyms
year-oldyearling

Example

More examples

"On May 18, a young Japanese couple was arrested after their one-year-old baby was found wrapped in a plastic bag and dumped in a gutter."

Etymology

From one + year + old.

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