What does companion and noun coordination marker mean?

Definition

A grammatical particle linking nouns as joint participants, either marking a companion or joining an exhaustive list of nouns.

Example sentences

• I go to school with my brother.🔊

  I go to school with my brother.

• I have a book and a bag.🔊

  I have a book and a bag.

companion and noun coordination marker in other languages

• In Portuguese
• In French
• In Japanese