1. An area or domain that has been thoroughly examined, studied, or researched
The detectives had thoroughly covered all investigated territory in their search for evidence.
Os detetives cobriram completamente todo o território investigado em sua busca por evidências.
2. A subject matter or field of knowledge that has already been explored and analyzed
The professor warned that this topic was well-investigated territory in academic circles.
O professor advertiu que este tópico era um território bem investigado nos círculos acadêmicos.