one-year-old

== English == === Etymology === From one +‎ year +‎ old. === Adjective === one-year-old (not comparable) Having lived or existed for one year. a one-year-old car ==== Synonyms ==== year-old ==== Translations ==== === Noun === one-year-old (plural one-year-olds) A child or animal that is one year of age. ==== Synonyms ==== yearling (certain animals) ==== Translations ==== === References === “one-year-old”, in Lexico, Dictionary.com; Oxford University Press, 2019–2022.