- Immersing hot, solid items in a cool liquid. Used as a means of tempering metals.
- The process extinguishing or ending abruptly. For example, the extinguishing an electric arc.
- The suppression, or reduction in the degree of something. For instance, the suppression of oscillation, or the reduction in the level of phosphorescence of a material.
- The process of cooling abruptly. For example, the treating of a metal by heating it and immersing it in a cold liquid.