Reheat/ˌriːˈhiːt/ Definition 1 of 3Pro Tip 1/3Food Preparation Used when making food ready to eat again, often in home kitchens. Mom reheated the stew we had last night. Pro Tip 2/3Microwave Common The word 'reheat' is typically associated with microwaves, a common appliance. I'll just reheat my coffee in the microwave. Pro Tip 3/3Domestic Use Most often used in a domestic setting rather than commercial or formal environments. Just reheat the lasagna for lunch, it's in the fridge.