reasonability

C2+ Topic:Describing Qualities

US /ˌrizənəˈbɪlɪti/ UK /ˌriːzənəˈbɪlɪti/ See IPA manual

noun

Meanings

1

noun
the quality of being reasonable, sensible, or fair

The court weighed the reasonability of the defendant's response.

Thesaurus

Synonyms

1 noun · the quality of being... reasonablenesssensiblenessrationality fairness sanity

Opposites

unreasonableness irrationality

Word family

Related forms reasonable reason reasonably

Etymology

From reasonable + -ity; reasonable from Old French raisonable, from Latin rationabilis, from ratio ('reckoning, reason').

rationabilis Latin ratio Latin

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Topics

Describing Qualities Word Formation & Derivatives

# reasonability

**Type:** Word
**Level:** C2+
**Part of speech:** noun
**IPA (US):** ˌrizənəˈbɪlɪti
**IPA (UK):** ˌriːzənəˈbɪlɪti

## Meanings
1. the quality of being reasonable, sensible, or fair

## Examples
- The court weighed the reasonability of the defendant's response.

## Synonyms
- reasonableness
- sensibleness
- rationality
- fairness
- sanity

## Antonyms
- unreasonableness
- irrationality

## Related Forms
- reasonable
- reason
- reasonably

## Roots and Affixes
- Root: rationabilis
- Root: ratio

## Etymology
From reasonable + -ity; reasonable from Old French raisonable, from Latin rationabilis, from ratio ('reckoning, reason').

## AI Etymology
Reasonability comes from reasonable + -ity; reasonable from Old French raisonable, from Latin rationabilis, from ratio ('reckoning, reason'). The historical chain includes Latin rationabilis and Latin ratio. Older glosses in the chain include "reckoning, reason", which help explain the semantic range of the modern word. Morphologically, reasonability is best read as compound, suffixal formation, and borrowing, yielding an English noun shaped by both form history and later usage. In current English it functions as a noun, with the sense "the quality of being reasonable, sensible, or fair". related forms include reasonable, reason, and reasonably. The result is an English noun whose etymology preserves the older forms while supporting the word's specialized modern meaning.

## Topics
- Describing Qualities
- Word Formation & Derivatives

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reasonability

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