acquaintance with facts, truths, or principles, as from study or investigation; general erudition: knowledge of many things.
familiarity or conversance, as with a particular subject or branch of learning: A knowledge of accounting was necessary for the job.
acquaintance or familiarity gained by sight, experience, or report: a knowledge of human nature.
the fact or state of knowing; the perception of fact or truth; clear and certain mental apprehension.
awareness, as of a fact or circumstance: He had knowledge of her good fortune.
something that is or may be known; information: He sought knowledge of her activities.
the body of truths or facts accumulated in the course of time.
the sum of what is known: Knowledge of the true situation is limited.
Archaic. sexual intercourse. Compare carnal knowledge.
creating, involving, using, or disseminating special knowledge or information: A computer expert can always find a good job in the knowledge industry.
to one's knowledge, according to the information available to one: To my knowledge he hasn't been here before.

1250–1300; Middle English knouleche, equivalent to know(en) to know1 + -leche, perhaps akin to Old English -lāc suffix denoting action or practice, cognate with Old Norse (-)leikr; cf. wedlock

knowledgeless, adjective
preknowledge, noun
superknowledge, noun

1. See information. 4. understanding, discernment, comprehension; erudition, scholarship. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
knowledge (ˈnɒlɪdʒ)
1.  the facts, feelings or experiences known by a person or group of people
2.  the state of knowing
3.  awareness, consciousness, or familiarity gained by experience or learning
4.  erudition or informed learning
5.  specific information about a subject
6.  sexual intercourse (obsolete except in the legal phrase carnal knowledge)
7.  come to one's knowledge to become known to one
8.  to my knowledge
 a.  as I understand it
 b.  as I know
9.  (Irish) grow out of one's knowledge to behave in a presumptuous or conceited manner

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

M.E. cnawlece. For first element see know. Second element obscure, perhaps cognate with the -lock "action, process," found in wedlock.
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

knowledge definition

artificial intelligence, information science
The objects, concepts and relationships that are assumed to exist in some area of interest. A collection of knowledge, represented using some knowledge representation language is known as a knowledge base and a program for extending and/or querying a knowledge base is a knowledge-based system.
Knowledge differs from data or information in that new knowledge may be created from existing knowledge using logical inference. If information is data plus meaning then knowledge is information plus processing.
A common form of knowledge, e.g. in a Prolog program, is a collection of facts and rules about some subject.
For example, a knowledge base about a family might contain the facts that John is David's son and Tom is John's son and the rule that the son of someone's son is their grandson. From this knowledge it could infer the new fact that Tom is David's grandson.
See also Knowledge Level.

The Free On-line Dictionary of Computing, © Denis Howe 2010
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American Heritage
Idioms & Phrases


see little knowledge is a dangerous thing; to the best of (one's knowledge).

The American Heritage® Dictionary of Idioms by Christine Ammer.
Copyright © 1997. Published by Houghton Mifflin.
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Example sentences
Reading will enhance your knowledge and your understanding of the world, and
  will give you something to talk about at parties.
These students are using technology to learn the skills needed for a knowledge
  economy and an information society.
The pursuit of information has been a human preoccupation since knowledge was
  first recorded.
Factual knowledge: knowledge about discrete chunks of information.
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