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)

retroact
retroaction
retroactive
retroactively
retroactivity
squat
1. To sit in a crouching position with knees bent and the buttocks on or near the heels.
2. To crouch down, as an animal does.
3. To settle on unoccupied land without legal claim.
4. To occupy a given piece of public land in order to acquire title to it.
5. Etymology: "to crouch on the heels", from Old French esquatir, "press down, lay flat, crush"; from es-, "out" (from Latin ex-) + Old French quatir, "press down, flatten"; from Vulgar Latin coactire "to press together, to force"; from Latin coactus, past participle of cogere, "to compel, to curdle, to collect"; from co- + agere, "to drive".
squatter
1. An illegal occupant of land or property; especially, someone who takes over and lives in another person's empty house.
2. A person or animal that crouches down.
subagitate
subagitation
subagitory
thermocoagulation
1. The process of converting tissue into a gel by heat.
2. Coagulation of tissue by the action of high-frequency currents; used in removal of growths and also used to produce stereotactic lesions in the brain.
3. Destruction and removal of tissue by coagulation utilizing high-frequency electric current.
thermoinactivation
Destruction of the power to act as a result of exposure to heat.
transact
transaction
transactional