de ‧ cath ‧ lon /dɪˈkæθlɒn, -lən $ -lɑːn, -lən/ BrE AmE noun [singular]
[ Date: 1900-2000 ; Origin: deca- + Greek athlon 'competition' ]
a sports competition with 10 different events ⇨ pentathlon , triathlon
de ‧ cath ‧ lon /dɪˈkæθlɒn, -lən $ -lɑːn, -lən/ BrE AmE noun [singular]
[ Date: 1900-2000 ; Origin: deca- + Greek athlon 'competition' ]
a sports competition with 10 different events ⇨ pentathlon , triathlon
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012