the activity of contributing to the fulfillment of a need or furtherance of an effort or purpose | any specific behavior |
a person or thing that is a resource that helps make something easier or possible to do | the trait of being active; moving or acting rapidly and energetically |
a means of serving | an organic process that takes place in the body |
a person who contributes to the fulfillment of a need or furtherance of an effort or purpose | 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 |