1. The primary or most important technique, procedure, or approach used to accomplish a goal or solve a problem
The principal method for treating this disease is chemotherapy.
O método principal para tratar essa doença é a quimioterapia.
2. In programming and mathematics, a fundamental or primary technique that forms the basis for other approaches
The principal method of data analysis in this study is regression analysis.
O método principal de análise de dados neste estudo é a análise de regressão.