Preheat means to heat up an oven or cooking surface before cooking. There are a variety of synonyms for preheat including:
1. Warm - This is a simple way to convey the same meaning as preheat.
2. Heat up - This phrase is commonly used in cooking to refer to the process of warming up the oven or stove.
3. Heat to - Use this phrase to refer to specific temperatures that the oven or stove should be heated to.
4. Bring to temperature - This phrase is more descriptive and refers to the process of raising the temperature of the oven or stove to the desired degree.
5. Raise the temperature - This is a more general way of conveying the same meaning as preheat, without specific temperature requirements.