1. A problem that has been recognized, confirmed, and accepted as real or significant over time
Climate change is now an established problem that affects global policy.
A mudança climática é agora um problema estabelecido que afeta as políticas globais.
2. A well-known issue or difficulty that has been thoroughly documented and studied
Poverty remains an established problem in developing nations.
A pobreza continua sendo um problema estabelecido nas nações em desenvolvimento.