non

non — adjective

1. added to the beginning of a word to form its opposite or to show that a person o

1.adjectiveA2
Definition

added to the beginning of a word to form its opposite or to show that a person or thing does not have the expected quality — for example, 'non-smoker' means a person who does not smoke, 'non-fiction' is writing about real events, and 'non-profit' describes an organisation that does not aim to make money

Example

The hotel has both smoking and non-smoking rooms for guests.

non- + [gerund adjective]: non-smoking

Christopher ordered a non-alcoholic drink at the party.

Common collocations
  • non-smoking area
  • non-alcoholic drink
  • non-fiction book
  • non-stick surface
  • non-refundable deposit
  • non-profit organisation
  • non-stop flight
  • non-violent protest
Synonyms
  • un-

    more common with adjectives (unhappy, unclear), while non- is preferred for neutral negation without positive/negative connotation

  • in-

    used with Latin-derived adjectives (inactive, invisible); less productive in modern English

  • dis-

    reverses or removes (disagree, disapprove), whereas non- simply negates without implying a prior state

  • -free

    suffix with positive connotation (sugar-free, smoke-free); non- is neutral

Grammar Patterns

non- + [adjective]

non- + [noun]

Usage Note

The hyphen after non- is common but not always required; many established compounds are written as a single word (e.g. nonstop, nonfiction). Check a dictionary when unsure, especially for formal writing. This prefix attaches freely to almost any adjective or noun, but note that some words have developed specialised compounds (non-profit, non-stick) where the meaning goes beyond simple negation.

Common Mistakes

This is a non sense answer.
This is a non-sense answer.
'non-sense' means 'not making sense'; 'nonsense' is the standard spelling for the noun meaning 'ridiculous talk'.
She is a non-smooker.
She is a non-smoker.
The base word must be spelled correctly; the prefix non- attaches to the unchanged word.
This is a non-profitable organisation.
This is a non-profit organisation.
'non-profit' is the standard compound; 'non-profitable' is rare and may confuse readers.

2. used before an adjective to show that something does not follow the usual or exp

2.adjectiveB2
Definition

used before an adjective to show that something does not follow the usual or expected way of doing things — for instance, non-standard spelling is spelling that is not considered correct in formal writing, and non-traditional methods are methods that differ from what has been done in the past

Example

The chef uses non-traditional ingredients such as chocolate in the spicy curry sauce.

The local dialect includes several non-standard grammatical forms that differ from textbook English.

collocation: non-standard + [linguistic term]

Common collocations
  • non-standard spelling
  • non-traditional method
  • non-conventional approach
  • non-traditional student
Synonyms
  • unconventional

    stronger and more positive tone, implying creativity; non-conventional is more neutral

  • alternative

    used as an adjective suggesting a deliberate choice; non-traditional merely states difference

  • irregular

    implies violation of a rule, often with a negative tone; non-standard is more neutral

Antonyms

Grammar Patterns

non- + [adjective of conformity]

Usage Note

Distinguish from sense 1: sense 1 simply negates a category (non-smoker = a person who does not smoke), while sense 2 describes something that deviates from an established norm (non-standard = not conforming to the standard, suggesting a contrast with what is normal or expected). The object is typically an abstract concept such as a method, approach, spelling, or belief.

Word family

Synonym discussion

Sense: adjective/1

English has several prefixes that express negation or absence, and choosing between them depends on the base word's origin and the shade of meaning. Non- is the most neutral and productive; it simply says 'not X' without implying the opposite is bad (non-smoker) or that a prior state existed. Un- is the most common negative prefix for Germanic-root adjectives (unhappy, unsafe) and often carries a mildly evaluative tone. In- (and its variants il-, im-, ir-) attaches to Latin-derived words (inactive, impossible, irregular) and is largely fossilised — you cannot freely attach in- to new words. Dis- reverses an action or state (disagree, disconnect) and usually implies taking something away rather than merely negating it. A- (amoral, asexual) means 'without' or 'lacking' and is limited to Greek-derived vocabulary. A practical tip: when forming a new negative compound, use non- unless the base word already has an established un- or in- form. For example, 'non-scientific' and 'unscientific' both exist but carry different connotations — non-scientific is a neutral classification (not belonging to science), while unscientific is a criticism (not following scientific method).

non-un-in-dis-a-

Common collocations

Nouns

Phrases

  • non-stop service
  • non-disclosure agreement
  • non-compete clause
  • non-proliferation treaty

Etymology

LatinOld FrenchMiddle EnglishEnglish

Non- comes from Latin 'non' meaning 'not', which is a contraction of 'ne oinom' ('not one'). It entered English through Old French 'non-' and became a highly productive prefix in Middle English. Unlike other negative prefixes (un-, in-), non- has always been freely attachable to new words, which is why it is the default prefix for contemporary coinages such as 'non-binary' and 'non-fungible'.