# nonlinear

/nɑnˈɫɪˌniɝ/ (US)

Source: https://englishreference.com/word/nonlinear
Updated: 2026-08-27

## Senses

### 1. mathematics and science

adjective · CEFR C1 · Academic · Technical

describes a relationship where the output is not directly proportional to the input.

For teachers: describing a system or function where the output does not change in direct proportion to the input, often involving variables with exponents other than one.

- The relationship between the two chemicals is nonlinear, so doubling one does not double the reaction.
- In nonlinear dynamics, small perturbations in the initial conditions can lead to vastly different outcomes, a phenomenon commonly known as the butterfly effect.

Usage: Typically used as a non-gradable adjective in scientific contexts.

### 2. narrative or time

adjective · CEFR C1 · Academic

describes a story or process that does not follow a straight, chronological order.

For teachers: describing a narrative structure or progression that deviates from chronological sequence, often employing flashbacks or parallel timelines.

- The movie has a nonlinear plot that jumps between the past and the present.
- Modernist literature frequently employs nonlinear structures to reflect the fragmented nature of human memory and consciousness.

### 3. geometry and molecules

adjective · CEFR C1 · Technical

describes points or atoms that do not lie on a single straight line.

For teachers: denoting a set of points or a molecular structure where the constituent parts are not arranged in a straight line.

- Water is a nonlinear molecule because its atoms are arranged in a V-shape.
- The researcher noted that the three points were nonlinear, forming a distinct triangle rather than a single vector.

## Examples

- The movie tells a nonlinear story that jumps between the past and present.
- Climate change is a nonlinear process where small temperature increases can trigger sudden, massive shifts in the environment.
- Modern video games often feature nonlinear gameplay, allowing players to choose their own objectives and explore the world in any order they prefer rather than following a fixed path.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.