earnest and conscientious activity intended to do or accomplish something | any specific behavior |
use of physical or mental energy; hard work | the trait of being active; moving or acting rapidly and energetically |
a notable achievement | an organic process that takes place in the body |
a series of actions advancing a principle or tending toward a particular end | 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 |