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tr.v. pre·heat·ed, pre·heat·ing, pre·heats
To heat (an oven, for example) beforehand.
to heat (an oven, grill, pan, etc) beforehand
to heat before using or before subjecting to a further process.
Past participle: preheated
To set an oven at the desired cooking temperature some time before it is needed so that the food to be cooked is placed into an oven that is already hot.