Definify.com
Webster 1913 Edition
Logic
Log′ic
,Noun.
[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; the science of 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 1828 Edition
Logic
LOG'IC
,Noun.
The art of thinking and reasoning justly.
Logic is the art of using reason well in our inquiries after truth, and the communication of it to others.
Logic may be defined, the science or history of the human mind, as it traces the progress of our knowledge from our first conceptions through their different combinations, and the numerous deductions that result from comparing them with one another.
Correct reasoning implies correct thinking and legitimate inferences from premises, which are principles assumed or admitted to be just. Logic then includes the art of thinking, as well as the art of reasoning.
The purpose of logic is to direct the intellectual powers in the investigation of truth, and in the communication of it to others.