It is short for "of the clock".
To say 7 o'clock, you say, Il est sept heures. To say 8 o'clock, you say, Il est huit heures.
'cinq heures'
Il est onze heure. (Its 11 o'clock.) You can't really say just 11 o'clock...
A 'Clock o Clay' or 'Clock a Clay' is 19th century Northamptonshire slang for a ladybird or ladybug, as in the line "Red black spotted Clock a Clay".
Why would you capitalize either O or C in the time o'clock?If you are referring to the title of a book or movie, there are numerous examples where both the O and C are capitalized, despite the O being a contraction of a preposition (of the clock).
To say 7 o'clock, you say, Il est sept heures. To say 8 o'clock, you say, Il est huit heures.
'Quinze heures'
huit heures
neuf heures
sept heures
'cinq heures'
un heures
quatre heures
Son las nueve
Nalunaaqutaq pingasunngorpat aallassaagut.
une heure vingt
O'clock is a contraction of 'of the clock' so it is a short way to say the time is three of the clock or whatever time being refered to.