WordReference Random House Learner's Dictionary of American English © 2019
knowl•edge /ˈnɑlɪdʒ/USA pronunciation   n. 
  1. [uncountable] acquaintance with facts, truths, or principles in the mind.
  2. familiarity with an area of study, as by study or experience:[countable;  singular;often: a + ~]His knowledge of Chinese is very good.
  3. the sum of what is known;
    information:[uncountable]Knowledge of the situation is limited.
  1. Idiomsto one's knowledge, according to the information available to one:To my knowledge, he never worked here.

WordReference Random House Unabridged Dictionary of American English © 2019
knowl•edge  (nolij),USA pronunciation n. 
  1. acquaintance with facts, truths, or principles, as from study or investigation;
    general erudition:knowledge of many things.
  2. familiarity or conversance, as with a particular subject or branch of learning:A knowledge of accounting was necessary for the job.
  3. acquaintance or familiarity gained by sight, experience, or report:a knowledge of human nature.
  4. the fact or state of knowing;
    the perception of fact or truth;
    clear and certain mental apprehension.
  5. awareness, as of a fact or circumstance:He had knowledge of her good fortune.
  6. something that is or may be known;
    information:He sought knowledge of her activities.
  7. the body of truths or facts accumulated in the course of time.
  8. the sum of what is known:Knowledge of the true situation is limited.
  9. [Archaic.]sexual intercourse. Cf. carnal knowledge.
  10. Idiomsto one's knowledge, according to the information available to one:To my knowledge he hasn't been here before.

  1. creating, involving, using, or disseminating special knowledge or information:A computer expert can always find a good job in the knowledge industry.
knowledge•less, adj. 
  • 1250–1300; Middle English knouleche, equivalent. to know(en) to know1 + -leche, perh. akin to Old English -lāc suffix denoting action or practice, cognate with Old Norse (-)leikr; compare wedlock
    • 1.See corresponding entry in Unabridged See  information. 
    • 4.See corresponding entry in Unabridged understanding, discernment, comprehension;
      erudition, scholarship.

Collins Concise English Dictionary © HarperCollins Publishers::

knowledge /ˈnɒlɪdʒ/ n
  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. to my knowledgeas I understand it
  7. as I know

'knowledge' also found in these entries:
Collocations: an [elementary, advanced, in-depth] knowledge of, has a [deep, profound] knowledge base, a [basic, rudimentary, general] knowledge of, more...

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