Question

what is the most important or largest meal of the day in the spanish speaking world el almuerzo el desayuno la merienda or la ensalda

Answer 1

Generally the largest/most important meal in Spanish‑speaking countries is the midday meal — el almuerzo (often called la comida in Spain and many Latin American countries).

Notes:
- In Spain the main meal is usually called la comida and is eaten in the early afternoon; la cena (dinner) is later and typically lighter.
- In many Latin American countries the midday almuerzo/comida is also the biggest, though habits vary and some families have a larger cena.
- La merienda is a light afternoon snack; el desayuno is breakfast. ("La ensalada" means a salad — not a meal type.)

If you tell me which country you mean I can give the local pattern.