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. Etymology: from Middle French coaguler, from Latin coagulatus, past participle of coagulare, "to cause to curdle"; from cogere, "to curdle, to collect"; from com-, "together" + agere "to drive, to move".
2. In medicine, the clotting of blood or the process by which the blood clots to form solid masses.
Tissue can also be subjected to coagulation by various means, as by electrocoagulation (coagulation [clotting] of tissue using a high-frequency electrical current applied locally with a metal instrument or needle with the aim of stopping bleeding); laser coagulation (produces light in the visible green wavelength that is selectively absorbed by hemoglobin, the pigment in red blood cells, in order to seal off bleeding blood vessels); or photocoagulation (coagulation [clotting] of tissue using a laser which produces light in the visible green wavelength that is selectively absorbed by hemoglobin, the pigment in red blood cells, in order to seal off bleeding blood vessels).
2. Etymology: from French cogent, "necessary, urgent" (14 century); from Latin cogentem , from cogere, "to curdle, to compel, to collect"; from com-, "together" + agere, "to drive".





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2. To consider seriously; to reflect upon; to turn over in one's mind: When the election for President of the U.S. takes place, voters will be cogitating about which candidate will be the best one for the country.
3. Etymology: from Latin cogitatus, past participle of cogitare, "to ponder, to weigh, to reflect, to think", from co-, short for com-, "with, together" + agitare, "to put in constant motion, to drive, to impel"; from agere, "to set in motion, to drive, to lead".


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2. A careful and serious mental reflection about something: David applied all of his cogitation and energy, contemplating what topic he should take for the next term paper in his science class at school.

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Motto of Shorter College, North Little Rock, Arkansas, USA.
Also translated as, "I think, therefore I exist."
Credited to Descartes [French philosopher] as a priori proof of one's existence in his Discourse on Method, and is used as the starting point for his philosophic system.