1. In grammar, a noun or noun phrase that follows a linking verb and renames or describes the subject of a sentence
In 'She is a teacher,' 'teacher' is the defining subject.
Em 'Ela é uma professora,' 'professora' é o sujeito definidor.
2. The entity or concept that serves as the primary focus or theme being analyzed, described, or discussed
The defining subject of the research was climate change adaptation.
O sujeito definidor da pesquisa foi a adaptação às mudanças climáticas.