Meaning of “companion” in the English Dictionary

"companion" in English

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companionnoun [ C ]

uk /kəmˈpæn.jən/ us /kəmˈpæn.jən/

companion noun [ C ] (PERSON)

B2 a person you spend a lot of time with often because you are friends or because you are travelling together:

The dog has been her constant companion these past ten years.
a travelling companion

in the past, a young woman who was paid to care for and provide friendship for an old or ill woman, especially while she was travelling

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companion noun [ C ] (OBJECT)

old-fashioned either of two matching objects:

I've still got one of the candlesticks but I've lost its companion.

companion noun [ C ] (BOOK)

used in the title of a type of book that gives you information on a particular subject or tells you how to do something:

the Music Lover's Companion

(Definition of “companion” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"companion" in American English

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companionnoun [ C ]

us /kəmˈpæn·jən/

someone or something you spend a lot of time with or travel with, or a friend who lives with you:

a pleasant traveling companion
He shared his cabin with his wife and constant companion of 62 years.

(Definition of “companion” from the Cambridge Academic Content Dictionary © Cambridge University Press)