octuplicaten.
/ɒkˈtjuːplɪkeɪt/, /ɒkˈtʃuːplᵻkeɪt/, U.S. /ɑkˈtəpləˌkeɪt/, /ɑkˈt(j)upləˌkeɪt/ Any one of eight identical or exactly corresponding copies; esp. in in octuplicate.
ΘΚΠ
the world > relative properties > relationship > imitation > [noun] > action of repeating in a copy or making a copy > duplicate or exact copy > of specific number in series
sextuplicate1908
octuplicate1923
1923 Scotsman 28 Mar. 1/3 Memoranda giving fuller particulars of the appointment may be obtained on written request, addressed to the Agent-General..who will receive applications for the position in octuplicate.
1934 Webster's New Internat. Dict. Eng. Lang. Octuplicate,..an eighth thing corresponding to seven others of the same kind; an exact copy of something of which seven other exact copies exist.
1947 Life 17 Nov. 52/2 (caption) Instruments in octuplicate, one for each of the eight engines, are examined..during check-ups before test.
1972 I. Baker Grave Doubt v. 69 Even my briefest report could only be submitted in octuplicate—one copy for the man who needed the information, the others to keep seven filing clerks happy.
1994 Time 4 Apr. 88/1 Once a year, the government sends you a W-2 form, which you fill out in something like octuplicate.
This is a new entry (OED Third Edition, March 2004; most recently modified version published online June 2022).
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n.1923