verb (used with object)
to put an end to the activities of (a person, body of persons, etc.): to suppress the Communist and certain left-leaning parties.
to do away with by or as by authority; abolish; stop (a practice, custom, etc.).
to keep in or repress (a feeling, smile, groan, etc.).
to withhold from disclosure or publication (truth, evidence, a book, names, etc.).
to stop or arrest (a flow, hemorrhage, cough, etc.).
to vanquish or subdue (a revolt, rebellion, etc.); quell; crush.
Electricity. to reduce or eliminate (an irregular or undesired oscillation or frequency) in a circuit.

1375–1425; late Middle English suppressen < Latin suppressus (past participle of supprimere to press down), equivalent to sup- sup- + pressus (see press1)

suppressedly [suh-prest-lee, -pres-id-] , adverb
suppressible, adjective
suppressive, adjective
suppressively, adverb
suppressor, suppresser, noun
nonsuppressed, adjective
nonsuppressive, adjective
nonsuppressively, adverb
nonsuppressiveness, noun
presuppress, verb (used with object)
quasi-suppressed, adjective
resuppress, verb (used with object)
self-suppressing, adjective
self-suppressive, adjective
unsuppressed, adjective
unsuppressible, adjective
unsuppressive, adjective
well-suppressed, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
suppress (səˈprɛs)
1.  to put an end to; prohibit
2.  to hold in check; restrain: I was obliged to suppress a smile
3.  to withhold from circulation or publication: to suppress seditious pamphlets
4.  to stop the activities of; crush: to suppress a rebellion
5.  electronics
 a.  to reduce or eliminate (unwanted oscillations) in a circuit
 b.  to eliminate (a particular frequency or group of frequencies) in a signal
6.  psychiatry
 a.  to resist consciously (an idea or a desire entering one's mind)
 b.  Compare repress to exercise self-control by preventing the expression of (certain desires)
[C14: from Latin suppressus held down, from supprimere to restrain, from sub- down + premere to press]

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., "to put down by force or authority," from L. suppressus, pp. of supprimere "press down, stop, check, stifle," from sub "down, under" + premere "push against" (see press (v.1)). Sense of "prevent or prohibit the circulation of" is from 1560.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

suppress sup·press (sə-prěs')
v. sup·pressed, sup·press·ing, sup·press·es

  1. To curtail or inhibit the activity of something, such as the immune system.

  2. To deliberately exclude unacceptable desires or thoughts from the mind.

  3. To reduce the incidence or severity of a condition or symptom, such as a hemorrhage.

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
She also learned that if two or more females occupy the same space, they may
  suppress each other's reproductive hormones.
The risk is that they suppress the essential autonomy of the creator in trying
  to do so.
First: the opinion which it is attempted to suppress by authority may possibly
  be true.
Suppress your gag reflex by dividing the chow mentally into smaller, more
  manageable portions.
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