a prefix meaning “not,” freely used as an English formative, usually with a simple negative force as implying mere negation or absence of something (rather than the opposite or reverse of it, as often expressed by un-1. ): nonadherence; noninterference; nonpayment; nonprofessional .

prefix representing L adv. nōn not Unabridged

causa sine qua non

[kou-sah si-ne kwah nohn; English kaw-zuh sahy-nee kwey non, kaw-zuh sin-ey kwah nohn]
noun Latin.
an indispensable condition; requisite.

literally, a cause without which not

de gustibus non est disputandum

[de goos-ti-boos nohn est dis-poo-tahn-doom; English dee guhs-tuh-buhs non est dis-pyoo-tan-duhm]
there is no disputing about tastes.

natura non facit saltum

[nah-too-rah nohn fah-kit sahl-toom; English nuh-toor-uh non fey-sit sal-tuhm, -tyoor-]
nature makes no leap.

non compos mentis

[nohn kohm-pohs men-tis; English non kom-puhs men-tis]
not of sound mind; mentally incapable of managing one's affairs.

non obstante

[nohn ohb-stahn-te; English non ob-stan-tee]

short for Anglo-Latin, Latin nōn obstante aliquō statūtō in contrārium any statute to the contrary notwithstanding

non placet

[nohn plah-ket; English non pley-sit]
it is not pleasing.

non possumus

[nohn poh-soo-moos; English non pos-uh-muhs]
we cannot.

persona non grata

[per-soh-nah nohn grah-tah; English per-soh-nuh non grah-tuh, grey-, grat-uh]
plural personae non gratae [per-soh-nahy nohn grah-tahy; English per-soh-nee non grah-tee, grey-, grat-ee] . Latin.
a person who is not welcome: He has become persona non grata in our club since his angry outburst.
a diplomatic representative unacceptable to an accrediting government. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
1.  indicating negation: nonexistent
2.  indicating refusal or failure: noncooperation
3.  indicating exclusion from a specified class of persons or things: nonfiction
4.  indicating lack or absence, esp of a quality associated with what is specified: nonobjective; nonevent
[from Latin nōn not]

non compos mentis (ˈnɒn ˈkɒmpəs ˈmɛntɪs)
mentally incapable of managing one's own affairs; of unsound mind
[Latin: not in control of one's mind]

persona non grata (pɜːˈsəʊnə nɒn ˈɡrɑːtə)
n , pl personae non gratae
1.  an unacceptable or unwelcome person
2.  a diplomatic or consular officer who is not acceptable to the government or sovereign to whom he or she is accredited

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

prefix meaning "not, lack of," or "sham," 14c., from Anglo-Fr. noun-, from O.Fr. non-, from L. non "not, not a," from Old L. noenum "not one" (*ne oinom). In some cases perhaps from M.E. non "not" (adj.), from O.E. nan (see not).

non compos mentis
1607, from L., lit. "not master of one's mind."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

non- pref.
Not: noninvasive.

non compos mentis non com·pos men·tis (nŏn kŏm'pəs měn'tĭs)
Not of sound mind and hence not legally responsible; mentally incompetent.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Cultural Dictionary
De gustibus non est disputandum [(day goos-ti-boos nohn est dis-poo-tahn-dem)]

Latin for “There's no disputing about taste.” Another version of this saying is “There's no accounting for taste.”

non compos mentis [(non kom-puhs men-tis)]

A phrase used to describe someone who is out of his or her mind and therefore not legally responsible for his or her actions: “It was determined by the court that the killer was non compos mentis.” From Latin, meaning “not having control of the mind.”

persona non grata [(puhr-soh-nuh non grah-tuh, grat-tuh)]

A person who is no longer favored or welcome: “After my angry words with the manager, I am persona non grata at the video store.” From Latin, meaning “an unacceptable person.”

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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American Heritage
Abbreviations & Acronyms
nonsmoking (area of restaurant)
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
Non degradable ones have become ugly nuisance, apart from being environmental
Non-native trees benefit from a monthly deep soaking.
But in summer, the river is also a wonderful place for non-anglers to enjoy the
  simple pleasures of easy days and mellow nights.
That's one reason gravel, vs non-permeable paving, was used throughout the
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