1. A person who is among the first to explore or settle a new country or area
The pioneers crossed the mountains to settle in the west.
Os pioneiros atravessaram as montanhas para se estabelecer no oeste.
2. A person who is among the first to develop or use a new technique, idea, or activity
She was a pioneer in the field of computer science.
Ela foi uma pioneira no campo da ciência da computação.
3. (verb) To be among the first to develop or use something new
He pioneered new methods in surgical techniques.
Ele foi pioneiro em novos métodos de técnicas cirúrgicas.