1. Knowledge acquired through personal experience, observation, and everyday interactions rather than formal education or structured learning
She gained informal knowledge about cooking from her grandmother's recipes and kitchen practices.
Ela adquiriu conhecimento informal sobre culinária através das receitas e práticas culinárias de sua avó.
2. Information or understanding that is not documented, certified, or systematically taught in academic or professional settings
The workers had informal knowledge of the production process that wasn't written in any manual.
Os trabalhadores tinham conhecimento informal do processo de produção que não estava escrito em nenhum manual.