ag-, agen-, act-, agi-, agit-

(Latin: to set in motion, to shake; to drive; to do, to act; to lead, to conduct, to guide)

Ab actu ad posse valet illatio. (Latin term)
Translation: "Inference from what has happened to what will happen is valid."

"The social worker was urged to consider ab actu ad posse valet illatio when assessing a case of potential child abuse."

ab agendo
1. Out of action: "The long distance runner was deemed ab agendo because of her broken leg."
2. Obsolete or retired: "The farmer's old tractor was considered ab agendo and so it could only be sold as an antique."
act
1. To do something; to exert energy or some force; to be employed or operative: "He acted promptly in the emergency."
2. To reach, to make, or to issue a decision on some matter.
3. To operate or function in a particular way; to perform specific duties or functions: "She acted as the child's substitute mother."
acta
Deeds.

Used in ancient Rome to refer to an account of actions or achievements.

Acta est fabula.
The drama has been acted out or "The play is over."

Words used at the close of a dramatic performance in the ancient Roman theater. They are said to be the dying words of Emperor Caesar Augustus.

The maxim may be appropriately spoken whenever a life or an unfolding event comes to an unhappy end or is simply concluded.

acta sanctorum
Deeds of the saints.

Accounts of the lives of the Christian martyrs and saints that are used in teaching the faith.

action
1. The process or state of acting or of being active: "The machine is not in action now."
2. Something done or performed; to act; perform a deed.
3. An act that one consciously wills to do and that may be characterized by physical or mental activity: "This was a crisis that demanded action instead of debate."
activate
1. To set in motion; to make active or more active.
2. To organize or to create (a military unit, for example): "The governor had to activate the National Guard."
3. To treat (sewage) with aeration and bacteria to aid decomposition.
4. In chemistry, to accelerate a reaction in, as by heat.
5. In physics, to make (a substance) radioactive.
6. In biology, to convert (certain biological compounds) into biologically active derivatives.
activated carbon, activated charcoal
A highly porous form of carbon, typically from wood, lignite, coal, or coconut shells; widely used as a filtration medium; with the purpose of removing taste and odor from water by absorbing organic compounds.
activated sludge
The semi-liquid, microbe-rich sediment that is added to secondary-stage sewage material in the activated-sludge process.
activated-sludge process, actilvated-sludge effluent
A widely used process for sewage treatment that raises the level of biological activity by increasing the contact between the wastewater and the actively growing micro-organisms.
activation
1. Making active and effective.
2. Stimulation of activity in an organism or chemical.
3. The activity of causing to have energy and to be active.
4. In medicine, the deliberate induction of a pattern of electrical activity in the brain, as in electroencephalography.
actively
Characterized by doing something that is usually done, or being able to do something physically or mentally.
activeness
1. Having the trait of being active; that is, moving, doing, or functioning.
2. Moving, or acting, rapidly and energetically.
activity
1. The state of being active.
2. Energetic action or movement; liveliness.
3. A specified pursuit in which a person partakes; such as, an educational process or procedure intended to stimulate learning through actual experience.
4. The intensity of a radioactive source.
5. The ability to take part in a chemical reaction.
6. A physiological process; such as, a respiratory activity.