1. Non-official or unofficial methods, routes, or channels used to accomplish something outside formal procedures or structures
They resolved the dispute through informal channels rather than going to court.
Eles resolveram a disputa por vias informais em vez de recorrer ao tribunal.
2. Unofficial networks or pathways used for communication, business transactions, or social interactions
Information often spreads through informal channels in the organization.
A informação frequentemente se espalha por vias informais na organização.