verb

1. To cause an increase in temperature of (an object or space); to cause to become hot (often with "up").

   “I'll heat up the water.”

2. To become hotter.

   “There's a pot of soup heating on the stove.”

3. To excite or make hot by action or emotion; to make feverish.

Synonyms: heat up, hot, hot up, stoke, warm up

noun

1. A system that raises the temperature of a room or building. Compare heater.

2. The act of making something hot.

   “The crucible was subjected to several heatings.”

adjective

1. Causing heat.