active

ac·tive

adj \ˈak-tiv\

Definition of ACTIVE

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