Pronunciation: (u-lim'pik sīz", ō-lim'-),[key] —adj. 1. of the dimensions or length prescribed for the Olympic Games and other major athletic competitions: an Olympic-size speed-skating oval. 2. (of a swimming pool) having a length of 55 yds. (50 m) and a width of at least 23 yds. (21 m). Also,O•lym'pic-sized".