1. A matter or problem that has been recognized, accepted, or settled as true or valid over time; a well-documented or widely acknowledged concern
Climate change is an established issue in environmental policy discussions.
A mudança climática é uma questão estabelecida nas discussões de política ambiental.
2. In legal or academic contexts, a matter that has been decided or proven through precedent or research
The established issue of workplace discrimination was addressed in the court decision.
A questão estabelecida da discriminação no local de trabalho foi abordada na decisão judicial.