Webster
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Webster’s Revised Unabridged Dictionary · 1913

Logic

Log′ic, n. [OE. logike, F. logique, L. logica, logice, Gr. λογική (sc. τέχνη), fr. λογικός belonging to speaking or reason, fr. λόγος speech, reason, λέγειν to say, speak. See Legend.] 1. The science or art of exact reasoning, or of pure and formal thought, or of the laws according to which the processes of pure thinking should be conducted; the science of the formation and application of general notions; the science of generalization, judgment, classification, reasoning, and systematic arrangement; correct reasoning.

Logic is the science of the laws of thought, as thought; that is, of the necessary conditions to which thought, considered in itself, is subject. Sir W. Hamilton.

☞ Logic is distinguished as pure and applied. "Pure logic is a science of the form, or of the formal laws, of thinking, and not of the matter. Applied logic teaches the application of the forms of thinking to those objects about which men do think." Abp. Thomson.

2. A treatise on logic; as, Mill's Logic.

Webster’s Revised Unabridged Dictionary, Noah Porter, editor (Springfield, Mass.: G. & C. Merriam, 1913). Public domain. Text as transcribed by MICRA, Inc., from Project Gutenberg. Changed for Deep Dive Bible: Greek, which our source spelled in Latin letters, set in Greek letters; entries of one spelling merged into one article; Greek words our source left out (shown as “?”), read from the 1898 printing, from the same plates (the Library of Congress’s copy), where the place could be found with certainty. Of the others, 1,362 (a word or a single letter each) were inferred by AI from the context by the dictionary’s own rules and are marked with a wavy underline (tap or point at one to see the note); the rest, which could not be inferred with confidence, are left as “?”.