my definition of pasta salad is our particular recipe that we have, because the recipe is called 'Pasta Salad' (our family is not too creative in the recipe naming department!

) The ones with the mayo based dressing are called macaroni salad, to me anyway. Here is our recipe:
Chunk salami
Chunk pepperoni
block cheese (any type you like, )
bell pepper, any color, we use green.
rotini pasta
italian salad dressing
Cook pasta, drain. While pasta is cooking dice up pepperoni, salami, cheeses, and bell pepper. Place in bowl. add cooked pasta to the bowl, and add italian dressing to that. mix and place in fridge. Feel free to add more dressing before serving.
Note: There are no specific measurements of how much stuff to put in here. Make it to your own tastes.