active

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active active immunity active site active transport optically active surface-active

Main Entry: ac·tive
Pronunciation: ak-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>
- ac·tive·ly adverb