Adjective prehistoric has 3 senses
  1. prehistoric, prehistorical - belonging to or existing in times before recorded history; "prehistoric settlements"; "prehistoric peoples"
    Antonym: present (indirect, via future, past)
    Antonym: future (indirect, via past, present)
  2. prehistoric - of or relating to times before written history; "prehistoric archeology"
  3. prehistoric - no longer fashionable; "my mother has these prehistoric ideas about proper clothes"
    Antonyms:
    fashionable, stylish (indirect, via unfashionable)
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