google also says "having a chemical or biological effect on something"
adjective: active
1.
engaging or ready to engage in physically energetic pursuits.
"although he was seventy he was still robust and active"
Similar:
mobile
energetic
agile
sporty
nimble
vigorous
vital
dynamic
sprightly
spry
lively
animated
bouncy
bubbly
perky
frisky
zestful
spirited
busy
bustling
occupied
involved
on the go
on the move
full of get-up-and-go
full of vim and vigour
full of beans
sparky
zippy
peppy
bright-eyed and bushy-tailed
go-go
Opposite:
listless
moving or tending to move about vigorously or frequently.
"I couldn't feel the baby moving, and it was normally very active"
characterized by busy or lively activity.
"they enjoyed an active social life"
(of a person's mind or imagination) alert and lively.
"Caroline nodded slowly, her active mind already racing ahead"
2.
pursuing an occupation or activity at a particular place or in a particular way.
"the artist was active in the 1920s"
participating or engaged in a particular sphere or activity in a positive or spontaneous rather than a passive way.
"she was an active member of the society"
Similar:
hard-working
busy
industrious
diligent
tireless
contributing
enterprising
influential
occupied
engaged
involved
enthusiastic
keen
committed
devoted
determined
zealous
militant
radical
go-getting
go-ahead
Opposite:
passive
indifferent
3.
(of a thing) working; operative.
"the old watermill was active until 1960"
Similar:
operative
working
functioning
functional
operating
operational
in action
in operation
in force
live
effective
effectual
powerful
potent
non-passive
non-inert
up and running
Opposite:
inactive
inert
(of an electric circuit) capable of modifying its state or characteristics automatically in response to input or feedback.
"the receiver is continuously active whenever the vehicle ignition is switched on"
(of a volcano) that is erupting or has erupted in historical times.
"the volcano became active on 28 March last year"
(of a disease) in which the symptoms are manifest; not in remission or latent.
"active colitis"
having a chemical or biological effect on something.
"active ingredients"