I'd say at least 5. I have had many great salads and I have also had salads that were just bowls of lettuce...😂

Going by the Wikipedia first paragraph definition any two items mixed together can be a salad.

A salad is a dish consisting of mixed ingredients, frequently vegetables. They are typically served chilled or at room temperature, though some can be served warm. Condiments and salad dressings, which exist in a variety of flavors, are often used to enhance a salad.

It's a well-known fact that the "L" in "salad" stands for lettuce. So no lettuce, no salad.

Only one ingredient: a vegetable. You could be eating a raw unsliced cucumber and it would be a salad.

Two veggies and some type of sauce is a salad. A proper salad has a variety of veggies, meat, cheese, crunchy bits and sauce.