Meaning of “ratio” in the English Dictionary

british dictionary

"ratio" in British English

See all translations

rationoun [ C ]

uk /ˈreɪ.ʃi.əʊ/ us /ˈreɪ.ʃi.oʊ/ plural ratios

C1 the relationship between two groups or amounts that expresses how much bigger one is than the other:

The ratio of men to women at the conference was ten to one/10:1.
The school is trying to improve its pupil-teacher ratio (= the number of teachers compared with the number of students).

More examples

  • Compute the ratio of the object's height to its weight.
  • What is the car's power to weight ratio?
  • The staff to student ratio has increased dramatically in the last five years.
  • The efficiency of a machine is the ratio between the energy it supplies and the energy put into it.
  • Pi is the ratio of a circle's circumference to its diameter.

(Definition of “ratio” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"ratio" in American English

See all translations

rationoun [ C ]

us /ˈreɪ·ʃIˌoʊ/ plural ratios

mathematics a comparison of two numbers calculated by dividing

Ratio is also a relationship between two groups or amounts that expresses how much bigger one is than the other:

a low student-teacher ratio
The ratio of men to women at the conference was ten to one.

(Definition of “ratio” from the Cambridge Academic Content Dictionary © Cambridge University Press)