Main Entry: ac·tive

Pronunciation: \ˈak-tiv\

Function: adjective

1 : capable of acting or reacting especially in some specific way <an active enzyme> <active nitrogen>
2 : tending to progress or to cause degeneration <active tuberculosis>
3 : exhibiting optical activity
4 : requiring the expenditure of energy <active calcium ion uptake>
5 : producing active immunity <active immunization>

—ac·tive·ly adverb