Final answer:
The correct definite article for the noun 'cuaderno' is 'el'.
Step-by-step explanation:
The correct definite article for the noun 'cuaderno' is el.
In Spanish, nouns are classified as either masculine or feminine. 'Cuaderno' is a masculine noun, so it takes the definite article 'el'.
Examples:
- El cuaderno azul (The blue notebook)
- El cuaderno de Pedro (Pedro's notebook)
Learn more about Definite articles in Spanish