I. O¹ , o /əʊ $ oʊ/ noun (plural O’s, o’s)

1. [uncountable and countable] the 15th letter of the English alphabet

2. [uncountable] spoken zero:
My phone number is six o four double two (=60422).

3. [uncountable] a common type of blood

[TahlilGaran] Dictionary of Contemporary English ▲

II. O² /əʊ $ oʊ/ interjection
[Date: 1100-1200; Origin: Natural sound]

1. used when praying to a god or, in the past, when speaking to someone in great authority:
O Lord, in you I put my trust.

2. another form of oh

[TahlilGaran] Dictionary of Contemporary English ▲

o' /ə/ preposition
‘of’ written as people sometimes say it informally:
a drop o' whisky
⇒ o'clock

[TahlilGaran] Dictionary of Contemporary English ▲

O2, the /ˌəʊ ˈtuː $ ˌoʊ-/
an entertainment area built within the dome of a building that used to be called the Millennium Dome in Greenwich, south east London. It was opened in June 2007.

[TahlilGaran] Dictionary of Contemporary English ▲

O2, the /ˌəʊ ˈtuː $ ˌoʊ-/
an entertainment area built within the dome of a building that used to be called the Millennium Dome in Greenwich, south east London. It was opened in June 2007.

[TahlilGaran] Dictionary of Contemporary English ▲

zero the number 0. Also used when saying there is nothing at all:
A million is written as one followed by six zeros.
a temperature of zero degrees
Our chances of success are virtually zero.
nil British English zero - used especially in the results of sports games:
United won the game three-nil.
In rural areas, employment opportunities are almost nil.
nought British English spoken zero – used in calculations and figures:
It has increased by nought point seven five per cent (=0.75%).
O used to say the number 0 like the letter O:
The code for Oxford is 0 one eight six five (=01865).

[TahlilGaran] English Thesaurus ▲

O
Hug(s) 
Octal 
Officer (military) 
Operator (telephone) 
Orgasm 
Outstanding 
Oxygen

[TahlilGaran] Acronyms and Abbreviations Dictionary ▲