ag-, agen-, act-, agi-, agit-
(Latin: to set in motion, to hurry, to shake; to drive; to do, to act; to lead, to conduct, to guide)
2. A difficult situation requiring urgent action.
3. Urgent requirements; pressing needs.
4. The needs, demands, or requirements intrinsic to circumstances, conditions, etc.
2. Making heavy demands on someone.
3. Requiring much effort or expense; demanding, urgent, pressing.
2. Characterized by much effort or expense; demanding.
Exigent and pressing suggest an urgency that requires prompt action.

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2. To use chemical compounds in a gaseous state to clear an area of insect pests or other unwanted organisms.
3. To scent with fumes; to perfume.
2. Etymology: "to make aromatic smoke as part of a ceremony" from Old French fumigation, from Latin fumigationem, fumigatio, from fumigare, "to smoke"; from fumus, "smoke, fume" + root of agere, "to drive".
The sense of "to expose (someone or something) to aromatic fumes" is originally a reference to a medicinal or therapeutic treatment.
"Some medical specialists suggest that a hyperactive adult might have brain damage and psychosis, but not necessarily."
2. A higher than normal level of activity.
A body organ can be described as hyperactive if it is more active than normal and a person's behavior can also be considered as hyperactive.
People who are hyperactive always seem to be in motion. They can't sit still; they may dash around or talk incessantly. Sitting still through a lesson can be an impossible task. They may roam around the room, squirm in their seats, wiggle their feet, touch everything, or noisily tap a pencil. They may also feel intensely restless.