Steam/stiːm/ Definition 1 of 7Pro Tip 1/2Visible Transformation Steam visibly rises and dissipates quickly; it represents change that can be seen. As the water boiled, steam rose from the pot into the air. Pro Tip 2/2Heat Indication Steam can indicate something is very hot. Use it to show caution or heat. You could see the steam coming off the freshly baked bread.