plural companions
3 a
: one that is closely connected with something similar
- The book is a companion to the television series with the same title.
b
: one employed to live with and serve another
- We hired a companion for our elderly mother.
4
: a celestial body that appears close to another but that may or may not be associated with it in space
5
: a book, manual, etc., that provides information or advice about a particular subject
- a companion to French New Wave cinema
- The Gardener's Companion
