The action or process of becoming hard or solid; hardening, solidification.

The action of making something hard (in various senses).

The action or process of making something hard or harder in consistency or texture, esp. deliberately, by some special process; spec. the process of…

The action or process of becoming hard or harder in consistency or texture; an instance of this.

Hardening. Obsolete.

Physical hardening. Obsolete. rare.

Hardening; induration. In quot. 1804 attributive.