There are multiple definitions - click on the translation that matches your context.

companheiro

substantivo

partial

common-law husband

noun

Comparative law notes

Brazil

Pursuant to sections 1,723 to 1,726 of the Brazilian Civil Code, "companheiro" is a person in a "união estável" (comparable to a common-law marriage). The Brazilian law imposes no requirement of living together in order for a "união estável" to exist.

Definitions of common-law husband

English

a man who is not officially a husband but is considered to be one in some countries because he has been living with his partner for a long time

Her common-law husband has contributed substantially to the mortgage payments on the house.