O

O

o [əu US ou] n plural O's o's

1.) [U and C]

the 15th letter of the English alphabet

2.) [U] spoken

zero

▪ My phone number is six o four double two (=60422) .

3.) [U]

a common type of blood

O ²

O [əu US ou] 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