1. A mail delivery service that operates at a regular, economical rate with no guaranteed delivery time
I sent the package via standard mail, so it may take 5-7 business days.
Enviei o pacote pelo correio padrão, então pode levar 5-7 dias úteis.
2. The basic postal service offered by national mail carriers, typically slower and cheaper than express options
Standard mail is the most economical option for non-urgent correspondence.
O correio padrão é a opção mais econômica para correspondência não urgente.