the act or faculty of perceiving, or apprehending by means of the senses or of the mind; cognition; understanding.
immediate or intuitive recognition or appreciation, as of moral, psychological, or aesthetic qualities; insight; intuition; discernment: an artist of rare perception.
the result or product of perceiving, as distinguished from the act of perceiving; percept.
Psychology. a single unified awareness derived from sensory processes while a stimulus is present.
Law. the taking into possession of rents, crops, profits, etc.

1350–1400; Middle English percepcioun (< Old French percepcïon) < Latin perceptiōn- (stem of perceptiō) comprehension, literally, a taking in. See percept, -ion

perceptional, adjective
nonperception, noun
nonperceptional, adjective
reperception, noun
self-perception, noun
unperceptional, adjective

1. awareness, sense, recognition. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
perception (pəˈsɛpʃən)
1.  the act or the effect of perceiving
2.  insight or intuition gained by perceiving
3.  the ability or capacity to perceive
4.  way of perceiving; awareness or consciousness; view: advertising affects the customer's perception of a product
5.  the process by which an organism detects and interprets information from the external world by means of the sensory receptors
6.  law the collection, receipt, or taking into possession of rents, crops, etc
[C15: from Latin perceptiō comprehension; see perceive]

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

late 15c., "receiving, collection," from L. perceptionem (nom. perceptio) "perception, apprehension, a taking," from percipere "perceive" (see perceive). First used in the more literal sense of the L. word; in secondary sense, "the taking cognizance of," it is recorded
in English from 1610s. Meaning "intuitive or direct recognition of some innate quality" is from 1827.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

perception per·cep·tion (pər-sěp'shən)

  1. The process, act, or faculty of perceiving.

  2. Recognition and interpretation of sensory stimuli based chiefly on memory.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Modern psychology describes this fundamental aspect of human perception under
  the heading of "Gestalt" psychology.
Yet, each of these works changed our perception of the known facts.
You need depth perception for your brain to be able to judge distance.
The psychological study of risk perception has found that an imposed risk
  almost always prompts more worry.
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