Serving to complete, supplement, or perfect something; having a completing or fulfilling function.
From explement with -ary suffix. The -ary ending (as in complementary, supplementary) creates an adjective meaning 'relating to or being an instance of.'
English has so many near-synonyms with different suffixes—explementary, complementary, supplementary all mean roughly the same thing but come from different etymological paths, showing how language loves repetition!
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