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• n  doubt or uncertainty as to whether something is the case
  this proves beyond peradventure that he is innocent
• r  by chance
  it may peradventure be thought that there never was such a time

• At the end of the fight La Barba, arm-weary, had shown past peradventure that he merited his title, long in dispute.
• My father peradventure will feel me, and I shall seem to him as a deceiver; and I shall bring a curse upon me, and not a blessing.
• In doing so we must demonstrate beyond peradventure of doubt that we are what we maintain.

• possibly
• perchance
• perhaps
• maybe
• mayhap