This is the 748th most frequent Spanish word.
contenido
"Contenido" means "content" in English.
In this sentence, 'contenido' refers to the subject matter or material presented in the book.
El contenido del libro es muy interesante.
The content of the book is very interesting.
Here, 'contenida' describes someone exercising self-restraint.
Ella se mantuvo contenida durante la discusión.
She remained restrained during the discussion.
In this sentence, 'contenido' refers to the substance that is inside the glass, such as a liquid.