Relating to or promoting communication or communion; tending to create shared understanding or connection between people.
From Latin communis (common) + -itive suffix (creating adjectives of tendency or quality). This is an extremely rare formation, possibly a scholarly neologism.
This word is so obscure it barely exists in published English—searching historical texts suggests it was perhaps coined once by a 19th-century philosopher and never adopted, a perfect example of how many possible English words never survive beyond their first use.
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