- active carbon
- active defense
- active duty
- active euthanasia
- active immunity
- active list
- active service
- active title
- active voice
- active weapon
- active-wear
- activism
- activity
- activize
- actomyosin
- acton
- actor
- actress
- actu
- actual
- actual cost
- actual range
- actual sin
- actuarial
- actuary
- actuate
- actuation
- actuator
- acuity
- aculeate
- aculeus
- acumen
- acuminate
- acumination
- acupuncture
- ack-ack
- acronycal
- activator
- active
- active current
- activist
- acuate
- acushla
- acute
- acute accent
- acute angle
- acute appendicitis
- acv
- acyclic
- acyl
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