This is the 449th most frequent Spanish word.
principio
"Principio" means "beginning," "principle," or "foundation" in English, depending on context.
Here, 'principio' refers to the start or onset of something, in this case, the class.
Al principio de la clase, el profesor explicó las reglas.
At the beginning of the class, the teacher explained the rules.
In this sentence, 'principio' means a fundamental idea or standard, specifically equality.
El principio de igualdad es fundamental en nuestra sociedad.
The principle of equality is fundamental in our society.
Here, 'principios' (plural) indicates moral rules or beliefs that guide one's actions.