preheat

verb

1. (transitive)To heat beforehand or in advance, to heat something in preparation for further action.

   “to preheat the oven for the casserole”

   “to preheat the spare room for the guests”

noun

1. (uncountable)The act of heating before another process.

   “The ratio of preheat to postheat is often important and can produce significant differences in speed and economy of coating and in the end result. The authors show the relationship between these variables for a vinyl coating powder on objects of varying mass.”