The definition of a companion is a partner to, friend who accompanies, mate or someone hired to help another.
(noun)See companion in Webster's New World College Dictionary
noun
Origin: ME compainoun < OFr compagnon < VL *companio, lit., bread fellow, messmate (calque of Goth gahlaiba, one who eats of the same bread < ga-, with + hlaifs, bread, loaf) < L com-, with + panis, bread
transitive verb
noun
Origin: Du kampanje, quarterdeck < OFr compagne, steward's room in a galley < It (camera della) compagna, (room of the) company, crew < VL compania: see company
See companion in American Heritage Dictionary 4
noun
Origin:
Origin: Middle English compaignyon
Origin: , from Old French compaignon
Origin: , from Vulgar Latin *compāniō, *compāniōn-
Origin: : Latin com-, com-
Origin: + Latin pānis, bread; see pā- in Indo-European roots
.noun
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