
Logic
Logic (from the Ancient Greek: λογική, translit. logikḗ), originally meaning “the word” or “what is spoken”, but coming to mean “thought” or “reason”, is generally held to consist of the systematic study of the form of valid inference. A valid inference is one where there is a specific relation of logical support between the assumptions of the inference and its conclusion. (In ordinary discourse, inferences may be signified by words like therefore, hence, ergo and so on.)
There is no universal agreement as to the exact scope and subject matter of logic (see § Rival conceptions, below), but it has traditionally included the classification of arguments, the systematic exposition of the ‘logical form’ common to all valid arguments, the study of inference, including fallacies, and the study of semantics, including paradoxes. Historically, logic has been studied in philosophy (since ancient times) and mathematics (since the mid19th century), and recently logic has been studied in computer science, linguistics, psychology, and other fields.

Logic (adjective)
logical

Logic (noun)
A method of human thought that involves thinking in a linear, stepbystep manner about how a problem can be solved. Logic is the basis of many principles including the scientific method.

Logic (noun)
The study of the principles and criteria of valid inference and demonstration.

Logic (noun)
The mathematical study of relationships between rigorously defined concepts and of mathematical proof of statements.

Logic (noun)
A modeltheoretic semantics.

Logic (noun)
Any system of thought, whether rigorous and productive or not, especially one associated with a particular person.
“It’s hard to work out his system of logic.”

Logic (noun)
The part of a system (usually electronic) that performs the boolean logic operations, short for logic gates or logic circuit.
“Fred is designing the logic for the new controller.”

Logic (verb)
To engage in excessive or inappropriate application of logic.

Logic (verb)
To apply logical reasoning to.

Logic (verb)
To overcome by logical argument.

Sentiment (noun)
A general thought, feeling, or sense.

Sentiment (noun)
Feelings, especially tender feelings, as apart from reason or judgment, or of a weak or foolish kind.