octuplicate

Latin; probably patterned after duplicate from Latin duplicare (“to double”).

octuplicate (countable and uncountable, plural octuplicates)

1. A set of eight like or identical things.
   • 1942, Mark Lemon, Henry Mayhew, Tom Taylor, Shirley Brooks, Sir Owen Seaman, Sir Francis Cowley Burnand, Punch:

     It was an understood thing in our squadron that no one was on any account to bring the Baron down, but some of our pilots had come close enough to see his beetling brows and purple cheeks reflected in octuplicate.

   • 1952, California Division of Highways, Equipment manual:

     A unit's actual transfer will be brought about through the issuance of a Form S-46, "Transfer Order," which is made up in octuplicate.

   • 1978, American Oil Chemists' Society, Lipids:

     Letters of nomination together with supporting documents must be submitted in octuplicate to Earl G. Hammond, Department of Food Technology […]

octuplicate (third-person singular simple present octuplicates, present participle octuplicating, simple past and past participle octuplicated)

1. To make eight copies of something