1. A distinctive feature or quality that serves to identify or distinguish someone or something; an essential or most important trait
Loyalty is a defining characteristic of his personality.
A lealdade é uma característica definidora da sua personalidade.
2. A trait that is most typical or representative of a person, group, or thing
Innovation is the defining characteristic of Silicon Valley companies.
A inovação é a característica definidora das empresas do Vale do Silício.