My understanding is that it is neither. The term "Olympiad" refers to a 4-year period between Olympic games. It was easier when the winter and summer games were in the same year, but now the word describes the summer games only. The Sochi games are technically called the 22nd Winter Games.
Officially the XXX Olympiad (30th)
Games of the XXX Olympiad or the 30th Olympics
the 30th olympiad has just ended
It is the 30th and is called the Games of the XXX Olympiad.
XXX for the 30th Olympiad
the London Olympics 2012 was the 30th modern olympiad .
30th = XXX Olympiad
No, the London 2012 Olympics was the 30th, hence it is called Games of the XXX Olympiad, XXX being Roman numerals for the number 30.
MMX is the answer to your answer. written by a 10 year old.
XXX Olympiad was the roman numeral for the 2012 Summer Olympics as it was the 30th Summer Olympic games (XXX=30)
The Games of the XXX (30th) Olympiad were held in 2012, in London.
30th Olympiad