Adjective newborn has 2 senses
  1. newborn - recently borne; "a newborn infant"
    Antonym:
    old (indirect, via young)
  2. newborn, newly arisen, new-sprung - having just or recently arisen or come into existence; "new nations"; "with newborn fears"
    Antonym: old (indirect, via new)
,Noun newborn has 1 sense
  1. neonate, newborn, newborn infant, newborn baby - a baby from birth to four weeks
    --1 is a kind of baby, babe, infant
    --1 has particulars:
     liveborn infant; low-birth-weight baby, low-birth-weight infant; postmature infant; premature baby, preterm baby, premature infant, preterm infant, preemie, premie; small-for-gestational-age infant, SGA infant; stillborn infant; term infant
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