verb (used without object)
to look or glance quickly or furtively, especially through a small opening or from a concealed location; peep; peer.
a quick or furtive look or glance; peep.

1325–75; Middle English piken (v.); perhaps dissimilated variant of kiken to keek

peak, peek, pique, piqué.

1. See peep1. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
peek (piːk)
1.  (intr) to glance quickly or furtively; peep
2.  a quick or furtive glance
[C14 pike, related to Middle Dutch kiken to peek]

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 14c., piken "look quickly and slyly," of unknown origin. The words peek, keek, and peep all were used with more or less the same meaning 14c.-15c.; perhaps the ultimate source was M.Du. kieken. The noun meaning "a peek, glance" is attested from 1844. Phrase peek-a-boo as a children;s game is attested
from 1599; as an adj. meaning "see-through" it dates from 1895.
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

PEEK definition

The command in most microcomputer BASICs for reading memory contents (a byte) at an absolute address. POKE is the corresponding command to write a value to an absolute address.
This is often extended to mean the corresponding constructs in any High Level Language.
Much hacking on small microcomputers without MMUs consists of "peek"ing around memory, more or less at random, to find the location where the system keeps interesting stuff. Long (and variably accurate) lists of such addresses for various computers circulate (see interrupt list). The results of "poke"s at these addresses may be highly useful, mildly amusing, useless but neat, or total lossage (see killer poke).
Since a real operating system provides useful, higher-level services for the tasks commonly performed with peeks and pokes on micros, and real languages tend not to encourage low-level memory groveling, a question like "How do I do a peek in C?" is diagnostic of the newbie. Of course, operating system kernels often have to do exactly this; a real C hacker would unhesitatingly, if unportably, assign an absolute address to a pointer variable and indirect through it.
[Jargon File]

The Free On-line Dictionary of Computing, © Denis Howe 2010
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Example sentences
Students who peek into the door of language yet cannot go further are being
  denied a key component of a university education.
Set your alarms early for the next few days to sneak a peek at a stargazing
But models are not the only way to peek into the future.
The museum recently sent out a sneak peek of what visitors to the new exhibit
  can expect.
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