any specific behavior | the act of making something harder (firmer or tighter or more compact) |
the trait of being active; moving or acting rapidly and energetically | the process of becoming hard or solid by cooling or drying or crystallization |
an organic process that takes place in the body | abnormal hardening or thickening of tissue |
a process existing in or produced by nature (rather than by the intent of human beings) | |
the state of being active | |
(chemistry) the capacity of a substance to take part in a chemical reaction | |