A rare term for one who is a companion or shares bread with another; a fellow participant.
From Medieval Latin companator, agent noun from companare, related to compania (company). The -tor suffix marks it as 'one who does' or 'one who is,' following Latin naming conventions.
Companator is so rare that few modern dictionaries include it, making it a perfect example of how English has lost hundreds of words for 'friend' and 'companion'—each with subtle shades of meaning that our language once preserved carefully.
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