As a Noun: 1. The quality of being very warm or hot. English = heat, hotness. 2. The measure of the amount of heat in something, the measure of how hot or cold it is. English = temperature. As a Verb or Adjective: 1. To be very warm, to have a high temperature. English = (be) hot. 2. To make something become very warm or have a high temperature. English = heat, make hot, heat up.