any specific behavior | earnest and conscientious activity intended to do or accomplish something |
the trait of being active; moving or acting rapidly and energetically | use of physical or mental energy; hard work |
an organic process that takes place in the body | a notable achievement |
a process existing in or produced by nature (rather than by the intent of human beings) | a series of actions advancing a principle or tending toward a particular end |
the state of being active | |
(chemistry) the capacity of a substance to take part in a chemical reaction | |