non-cyclic

IPA/ˌnɒnˈsɪk.lɪk/
IPA/ˌnɑːnˈsɪk.lɪk/

non-cyclic — adjective

1. describing something that does not happen again and again in a fixed pattern, bu

1.adjectiveC1
Definition

describing something that does not happen again and again in a fixed pattern, but only once or in no set order

Example

Sivan's research focused on non-cyclic weather events that struck the island only once each century.

non-cyclic + event noun for one-off occurrences

The accountant explained that the bonus was a non-cyclic payment, not part of the regular monthly salary.

non-cyclic + payment/cost in finance contexts

Common collocations
  • non-cyclic event
  • non-cyclic payment
  • non-cyclic cost
  • non-cyclic change
Synonyms
  • one-off

    informal; emphasises a single occurrence

  • irregular

    broader; covers any non-fixed pattern

  • non-recurring

    common in finance and accounting reports

Antonyms
  • cyclic

    happening again in a fixed pattern

  • recurring

    happening more than once at intervals

Grammar Patterns

non-cyclic + noun

Usage Note

Typically appears before nouns describing events, payments, costs, or changes; rarely used predicatively outside business and scientific writing. Distinguish from sense 2, which is a chemistry term.

Common Mistakes

My morning routine is non-cyclic.
My morning routine is irregular.
for everyday non-repeating habits, use 'irregular' or 'one-off'; 'non-cyclic' sounds technical.

2. in chemistry, describing a molecule whose atoms form an open chain rather than j

2.adjectiveC2
Definition

in chemistry, describing a molecule whose atoms form an open chain rather than joining up into a closed ring

Example

Cyrus drew a diagram showing how the non-cyclic structure of the molecule allowed extra bonds at each end.

non-cyclic + structure/molecule in chemistry

The chemistry teacher asked Eri to label the non-cyclic compound on the whiteboard.

non-cyclic + compound for open-chain substances

Common collocations
  • non-cyclic molecule
  • non-cyclic compound
  • non-cyclic structure
  • non-cyclic hydrocarbon
Synonyms
  • acyclic

    more technical, preferred in academic chemistry

  • open-chain

    descriptive; common in textbooks

Antonyms

Grammar Patterns

non-cyclic + chemistry noun

Usage Note

Restricted to chemistry and biochemistry writing. Distinguish from sense 1, which is the general 'not repeating' meaning; this sense always refers to the shape of a molecule's atomic structure.

Common Mistakes

The water was non-cyclic.
The molecule was non-cyclic.
this sense applies only to a molecule's structure, not to substances in general.

Word family

Synonym discussion

Sense: adjective/1

All four words describe things that do not happen on a fixed schedule, but they differ in register and scope. 'Non-cyclic' is formal and often signals that the writer is contrasting with a true cycle (business cycle, seasonal cycle, weather cycle); it is common in economics, science, and accounting. 'Non-recurring' is the standard term in finance and accounting reports, especially for one-time costs or revenues that should not be projected forward. 'One-off' is more conversational and emphasises that something happens exactly once, with no expectation it will return. 'Irregular' is the broadest: it simply means there is no fixed pattern, which may still allow occasional repetition. So you would say 'a non-recurring legal fee', 'a one-off charity concert', 'irregular sleep hours', but reserve 'non-cyclic' for cases where you are explicitly denying a cycle, as in 'non-cyclic unemployment' or 'non-cyclic weather events'.

non-cyclic ↗non-recurringone-off ↗irregular ↗

Common collocations

Nouns

Phrases

  • non-cyclic in nature

Etymology

GreekLatinEnglish

Formed in modern English by adding the prefix 'non-' (meaning 'not') to the adjective 'cyclic'. 'Cyclic' itself reaches English through Latin 'cyclicus' from Greek 'kyklikos', built on 'kyklos' meaning 'circle' or 'wheel'. The chemistry sense follows the same path: nineteenth-century chemists borrowed 'cyclic' to label ring-shaped molecules, and 'non-cyclic' arose naturally as its open-chain opposite.