# rationality

/ˌɹæʃəˈnæɫɪti/ (US) · /ɹˌæʃənˈælɪti/ (UK)

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

## Senses

### 1. logical thinking

noun · CEFR C1 · Academic

the ability to think clearly and make decisions based on reason and facts.

For teachers: the quality of being consistent with or based on logic and reason. Uncountable in its general sense.

- We need to use rationality rather than anger to solve this problem.
- The philosopher argued that human rationality is often compromised by deep-seated cognitive biases and emotional responses.

Usage: Often used with the definite article 'the' or as an abstract uncountable noun.

### 2. a specific reason or system

noun · CEFR C2 · Academic · Formal

a particular way of thinking or a set of reasons for doing something.

For teachers: a specific rational motive or a system of beliefs based on logical principles. Countable in this specific context.

- The economic rationality behind the decision was difficult for the public to understand.
- The study examines the competing rationalities of environmental activists and industrial developers during the planning phase.

Usage: Can be used in the plural ('rationalities') when comparing different systems of thought.

## Examples

- We need to use rationality to solve this problem.
- In times of crisis, maintaining a sense of rationality helps leaders avoid making impulsive decisions based on fear.
- The philosopher argued that human rationality is often limited by cognitive biases, making it difficult for even the most logical thinkers to remain perfectly objective.

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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.