Logic
Part of speech: noun
Definition: A method of human thought that involves thinking in a linear, step-by-step manner about how a problem can be solved. Logic is the basis of many principles including the scientific method. The study of the principles and criteria of valid inference and demonstration. The mathematical study of relationships between rigorously defined concepts and of proof of statements. A formal or informal language together with a deductive system or a model-theoretic semantics. Any system of thought, whether rigorous and productive or not, especially one associated with a particular person. The part of an electronic system that performs the boolean logic operations, short for logic gates or logic circuit.
Reason
Part of speech: verb
Definition: To exercise the rational faculty; to deduce inferences from premises; to perform the process of deduction or of induction; to ratiocinate; to reach conclusions by a systematic comparison of facts.Hence: To carry on a process of deduction or of induction, in order to convince or to confute; to formulate and set forth propositions and the inferences from them; to argue.To converse; to compare opinions.To arrange and present the reasons for or against; to examine or discuss by arguments; to debate or discuss.To support with reasons, as a request.To persuade by reasoning or argument.To overcome or conquer by adducing reasons; — with down.To find by logical process; to explain or justify by reason or argument; — usually with out.
Part of speech: noun
Definition: A cause:# That which causes something: an efficient cause, a proximate cause.#: The reason this tree fell is that it had rotted.#* 1996, Daniel Clement Dennett, Darwin's Dangerous Idea: Evolution and the Meanings of Life, page 198,#*: There is a reason why so many should be symmetrical: The selective advantage in a symmetrical complex is enjoyed by all the subunits# A motive for an action or a determination.#: The reason I robbed the bank was that I needed the money.#* 1806, [Anonymous], Select Notes to Book XXI, in, Alexander Pope, translator, The Odyssey of Homer, volume 6, London, F.J. du Roveray, page 37,#*: This is the reason why he proposes to offer a libation, to atone for the abuse of the day by their diversions.#* 1881, Henry James, The Portrait of a Lady, chapter 10,#*: Ralph Touchett, for reasons best known to himself, had seen fit to say that Gilbert Osmond was not a good fellow.# An excuse: a thought or a consideration offered in support of a determination or an opinion; that which is offered or accepted as an explanation.#* 1966, Graham Greene, The Comedians, Penguin Classics edition, ISBN 0140184945, page 14,#*: I have forgotten the reason he gave for not travelling by air. I felt sure that it was not the correct reason, and that he suffered from a heart trouble which he kept to himself.# proof, more or less decisive, for an opinion or a conclusionThe cognitive faculties, collectively, of conception, judgment, reasoning, and intuition; the ability to think.Something reasonable, in accordance with thought; justice.due exercise of the reasoning facultyratio; proportion.
Example sentence: Reason has always existed, but not always in a reasonable form.