The quality of being spicy, or having a strong, hot flavor.
Spicinesses can make food taste exciting and interesting.
Examples:
I like the spicinesses of the hot sauce.
The spicinesses of the curry made my mouth feel hot.
The spicinesses in the salsa made my eyes water.
The spicinesses of the chili pepper surprised me.
The spicinesses of the dish were so strong, it felt like my mouth was on fire.
The spicinesses of the food made it hard to eat, but I liked it anyway.