Used, chiefly in literary or formal contexts, meaning ‘to accompany or be the companion of’.
Definitions
To accompany or act as a companion to (someone). She companioned the explorer on the first leg of his journey.
Attributive use meaning ‘serving as a complement or match; accompanying’ (e.g. companion volume, companion animal).
Definitions
Serving to accompany or complement another person or thing. The museum published a companion volume to the exhibition catalogue.