Correct spelling


Correct spelling, explanation: tri is a suffix for three, the same way as di or bi is a suffix for two. Athlon is a Greek word for contest, so to describe a triple contest, the word triathlon was created. Triathlon, same as biathlon or decathlon is basically a Greek word adapted to English.

Definition of triathlon:
1. a contest that consists of three sports: swimming, running, and cycling.
I’d love to participate in a triathlon, but I can’t swim fast enough.
To win a triathlon, you must be a versatile sportsperson and have good stamina.

Incorrect spelling


Incorrect spelling, explanation: if you struggle with the spelling of the word triathlon, you can remember that athlon is the base word for athlete. Similar, right? On the other hand, athalon from triathalon could not be a base word for athlete, so always remember this simple rule whenever spelling triathlon.