Meaning of O in English

O

I. ˈō noun

( plural o's or os ˈōz)

Usage: often capitalized, often attributive

Date: before 12th century

1.

a. : the 15th letter of the English alphabet

b. : a graphic representation of this letter

c. : a speech counterpart of orthographic o

2. : a graphic device for reproducing the letter o

3. : one designated o especially as the 15th in order or class

4. : something shaped like the letter O ; especially : zero

II. abbreviation

1. ocean

2. ohm

3. old

4. order

5. over

Merriam-Webster's Collegiate English vocabulary.      Энциклопедический словарь английского языка Merriam Webster.