If something's exact it means it's precise and completely accurate — as opposed to a guess, an estimate or an approximation.
Exact also has the meaning of taking something from someone, often money, and generally only given up with reluctance under the threat of force. The Mob might exact a shakedown from unfortunate businessmen, for example. The word comes from the Latin exactus "exact or accurate," a form of the verb exigere — meaning "to force out or demand," like the Mob demanding its money.
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adj |
marked by strict and particular and complete accordance with fact
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2 |
v |
take as an undesirable consequence of some event or state of affairs
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