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firstborn

Definitions of firstborn
  1. adjective
    first in order of birth
    “the firstborn child”
    synonyms: eldest
    first
    preceding all others in time or space or degree
  2. noun
    the offspring who came first in the order of birth
    synonyms: eldest
    see moresee less
    type of:
    issue, offspring, progeny
    the immediate descendants of a person
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