English edit

Etymology edit

From one +‎ year +‎ old.

Adjective edit

one-year-old (not comparable)

  1. Having lived or existed for one year.
    a one-year-old car

Synonyms edit

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Noun edit

one-year-old (plural one-year-olds)

  1. A child or animal that is one year of age.

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References edit