What makes a salad?

[MyGastIsFlabbered]

For me it's lettuce, I can have a fridge full of salad ingredients but if I haven't got lettuce then it's not a salad it's just a collection of vegetables on a plate. I wondered if this is just me?

Definitely diced cucumber and lettuce especially green leaf lettuce

Any combination of cold, vegetably ingredients for me. Can included carbs, roasted veg and/or pulses.