This appears to be a misspelling or archaic variant of 'distribution'; it is not standard modern English.
Likely a historical variant or scribal error of distribution (Latin distribuere + -tion suffix). Found occasionally in very old texts but not in contemporary use.
Sometimes old English had variant spellings that seem bizarre to modern readers—'distributution' might appear in 1600s documents, showing that standardized spelling is actually a fairly recent luxury.
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