General Definition:
* A person who spends time with another person. This can be a friend, a family member, or someone who is simply in the same place at the same time.
* Someone who is close to another person and shares their interests and activities. This implies a level of intimacy and connection.
More Specific Meanings:
* A person who accompanies another person on a journey or adventure. This could be a travel companion, a hiking buddy, or even a pet.
* A person who provides company and support to someone who is lonely or isolated. This could be a caregiver, a volunteer, or a friend who checks in regularly.
* A person who lives with another person and shares their life. This often refers to a roommate, a partner, or a spouse.
Other Uses:
* Companion animal: This refers to a pet, such as a dog or cat, that provides companionship.
* Companion book: This is a book that is intended to be read alongside another book, providing additional information or context.
* Companion piece: This is a piece of art or music that is intended to be viewed or listened to in conjunction with another piece.
Ultimately, the meaning of "companion" depends on the specific context in which it is used.
Do you have a specific example in mind? I'd be happy to explain what it means in that context.