Relating to or characteristic of an election or the act of electing.
From 'election' plus the suffix '-ary' (of or relating to). This word developed in medieval and early modern English as a more formal synonym for 'electoral,' but largely fell out of use by the 19th century.
Languages naturally consolidate competing words, and 'electionary' lost the battle to 'electoral'—both mean essentially the same thing, but 'electoral' is shorter and comes from a more 'prestigious' Latin source, giving it a survival advantage!
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