› used in
speech
to
mean
zero: My
phone
number
is three, one, o, five, one,
double
o (= 3105100). The
year
1705 is usually
pronounced
seventeen o five.Cardinal numbers, including nought and zero

(Definition of O, o noun (ZERO) from the Cambridge Advanced Learner's Dictionary & Thesaurus
© Cambridge University Press)

Focus on the pronunciation of O, o
You are looking at an entry to do with Numbers: cardinal, including nought & zero, but you might be interested in these topics from the **Mathematics & arithmetic** topic area:

- Addition, subtraction, multiplication & division
- Averages
- Branches & types of mathematics
- Calculations & calculating
- Fractions
- Geometrical & mathematical instruments
- Geometrical shapes
- Geometry: bends, loops & curves
- Geometry: describing angles, lines & orientations
- Geometry: parts of geometrical shapes
- Geometry: properties of circles & curves
- Mathematical symbols
- Numbering & counting
- Numbers generally
- Numbers: groups of things according to number
- Numbers: ordinal
- Numbers: single, double & multiple
- Numerical relationships
- Statistics
- Tables, graphs & diagrams
- Terms for numbers

“O, o”: synonyms and related words:

Read our blog about how the English language behaves.

Find words and meanings that have just started to be used in English, and let us know what you think of them.