A person who works together with others on a shared project or goal; a co-worker or partner.
From Latin 'com-' (together) and 'laborare' (to work), plus '-er' suffix. The 'co-' prefix and 'laborer' became 'colaborer,' though 'collaborator' is now the standard modern form.
English spelling has shifted so much that 'colaborer' is now considered archaic, but it's a beautiful reminder that 'labor' and 'work' come from the same root—a laborer and a colaborer were originally the same thing!
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