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17.
1. The governing force by which the universe is supposed to operate, but doesn't really.

Non-operation is defined in the sense of a computer program having an error in its programming. Sense life has not crashed, we are forced to conclude that the universe operates.

An extremely logical person will attempt to relate every event, emotion, and idea into a universal truth and will probably devote the entirety of their life to this endeavor, possibly to the point of obsession. When they fail utterly they can only say that they did the most logical thing possible.

2. An excuse to ignore the emotions, logic, ability, or worth of others in order to do whatever the hell one wants.
Boy: Why do you say that?
Girl: Monkeys are invading the world.
Boy: Where?
Girl: Everywhere.
The boy looks around the room.
Boy: But I do not see any monkeys. If monkeys are invading the world everywhere then they should be here as well. Therefore I am forced to conclude that your statement is false unless you have some other information to show me otherwise.
Girl: Stop being so damn logical! It was a freaking joke, you damn bastard! I HATE YOU! #@$&%#&@$&%#@$&!!!
by Dr. Batido November 25, 2005
 
1.
Systematic thinking process of coming to the best solution, which somehow seems evade most parents.
Lack of Logic:
"Take out the garbage and wheel the garbage can to the road"
"But Mom, it's only Saturday, the trash gets picked up on Mondays"
"DON'T ARGUE WITH ME!"
by Blaalien March 20, 2006
 
2.
Something that makes Vulcans sexually aroused. Vulcans usually raise an eyebrow and look at their superior officers suggestively when they find something logical.
"Very . . . logical. Captain Kirk..."
by WhoisHomer February 05, 2005
 
3.
An archaic custom or practice which anthropologists believe people of ancient times may have used to help influence their decision making ability. This lost art is sadly neither relevant nor present in the post-modern era.
To not provide an example would be beyond all logic.
by nethcev! August 31, 2006
 
4.
Logic (from the Greek λογική, logikē)1 refers to both the study of modes of reasoning (which are valid and which are fallacious)2 and the use of valid reasoning. In the latter sense, logic is used in most intellectual activities, including philosophy and science, but in the first sense, is primarily studied in the disciplines of philosophy, mathematics, semantics, and computer science. It examines general forms that arguments may take. In mathematics, it is the study of valid inferences within some formal language.3 Logic is also studied in argumentation theory.4

Logic was studied in several ancient civilizations, including India,5 China,6 and Greece. In the west, logic was established as a formal discipline by Aristotle, who gave it a fundamental place in philosophy. The study of logic was part of the classical trivium, which also included grammar and rhetoric.

Logic is often divided into three parts, inductive reasoning, abductive reasoning, and deductive reasoning.
What are you working on Charles?
Oh, I am doing logic homework!

What is it about?
Oh, its a subject about reasoning in a logical manner, I am doing a proof that involves the transitive property of equality.
by david faustino November 07, 2012
 
5.
Something that makes mathematical sense.

Exact reasoning, or knowing what is true and how to know whether it is true.

The by-product of thinking without relying on emotions.
Simple logic: If the kid smokes weed and smoking weed will cause cancer, therefore the kid will get cancer. (even though that's open for debate).

There is no form of logic in a woman's method of thinking.
by AYB October 18, 2003
 
6.
Logic: A system of reasoning.

Synonym: Reason, Judgment, Common sense.
Antonym: Leviathan, Conservatism, George W. Bush.
Leviathan was at his best today, attempting to defy logic.
by anonymous June 12, 2004
 
7.
A class usually only offered at college that deals with the analysis and appraisal of arguments. There are different systems of logic for different uses, including syllogistic logic (an ancient form of logic dealing with categories), propositional logic (dealing with statements dependence on each other), quantificational logic (a sort of combination of syllogistic and propositional), modal logic (dealing with necessity and possibility), deontic logic and imperative logic (dealing with "can," "should," "will," etc.) and belief logic (dealing with patterns of belief). Most of these systems can be combined with each other and I'm pretty sure there's Wikipedia articles about all of them if you want to know more. Some classes will also cover formalized ethics (building an ethical theory with these previous systems), metalogic (the study of the logical systems themselves) and various forms of reasoning and argumentation.

It is sometimes described as math without numbers, because you learn various formulas to calculate whether or not a statement is true or false in a particular context, but the only numbers you ever see are 0 for false and 1 for true. It is also possibly the worst college course about having people bitch about how hard it is when in reality it's one of the easiest courses you can take.
Imagine a kid with Down's Syndrome handing you a piece of paper with various statements relating to the same thing on it and asking you if they make sense together. If you could handle this, you can handle a logic course. If not, you probably need to take a logic course.
by eyehatemeyeself March 19, 2010