ratio

C1 Topic:Numbers & Quantity

US /ˈɹeɪ.si.əʊ/ UK /ˈɹeɪ.ʃi.əʊ/ See IPA manual

Freq #12191

Meanings

1

noun
The relationship between two amounts, showing how much of one there is compared to the other.

The ratio of teachers to students is one to fifteen.

Thesaurus

Synonyms

1 noun · the relationship between... proportion

Word family

Forms ratios

Derived forms cross-ratioeigenratiom-ratioratio'dratioedratiolessratiometerratiometricratiometrysubratio

Related forms irrationalobiterrational

Appears in

Phrases (1)

See all

compression ratio
the discharge pressure of a gas compressor divided by its intake pressure

Noun + noun

Etymology

Borrowed from Latin ratiō. Doublet of ration and reason.

*h₂er- Proto-Indo-European

View etymology graph ->

Topics

Numbers & Quantity

External links

# ratio

**Type:** Word
**Level:** C1
**Part of speech:** noun
**IPA (US):** /ˈɹeɪ.si.əʊ/
**IPA (UK):** /ˈɹeɪ.ʃi.əʊ/
**Frequency rank:** 12191

## Meanings
1. The relationship between two amounts, showing how much of one there is compared to the other.

## Examples
- The ratio of teachers to students is one to fifteen.

## Derived Forms
- cross-ratio
- eigenratio
- m-ratio
- ratio'd
- ratioed
- ratioless
- ratiometer
- ratiometric
- ratiometry
- subratio

## Related Forms
- irrational
- obiter
- rational

## Roots and Affixes
- Root: *h₂er-

## Etymology
Borrowed from Latin ratiō. Doublet of ration and reason.

## AI Etymology
Ratio is borrowed from Latin ratiō. Doublet of ration and reason. The historical chain includes *h₂er- (Proto-Indo-European). The surrounding word family includes derived forms such as cross-ratio, eigenratio, m-ratio, and ratio'd and related forms such as irrational, obiter, and rational. In present use it covers the relationship between two amounts, showing how much of one there is compared to the other.

## Topics
- Numbers & Quantity

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