Definitions

1. noun

a coefficient in mathematics, especially one with a negative value

“The cofactor matrix was used to solve the system of linear equations.”

2. noun

a person who accompanies and assists a person of higher status, especially on ceremonial occasions

“The cofferman walked alongside the queen during the procession.”

3. noun

a person who shares or accompanies someone, especially in a social or professional context

“The co-founder of the company will be speaking at the conference.”