It's pentathlon
You say, "I am going to a contest", this means you are going to watch a contest. "I am going for a contest", this is odd to say but means that you are hoping or choosing a contest. If you say "I am in/entering a contest", you are saying you are going to attend a contest.
athlete
Tetra means four, and the thon/thlon ending generally means event. Therefore, a Tetrathlon is an a contest where four successive events are taken place. You could have figured this out from simple recognizing the prefix and seeing what words are related. A Triathlon is a contest where three events take place after the other. Tetra replaces Tri, but the idea of the word stays the same. The events of a tetrathlon are shooting, running, swimming and cross-country riding.
The concepts are the most fundamental points to understanding the competitor. It means the concepts are key to understanding the strengths and weaknesses of the competitor.
Because it is a combination (a combined event) of ten individual events by the same person.A decathlon is, in orderDay 1100mLong JumpShot PutHigh Jump400 mDay 2110HDiscusPole VaultJavelin1500mRead more: What_are_the_olympic_field_events_in_the_decathlon
It means to be a participant in a contest, to which word it is obviously related. Another related word is contender, which means someone who contends in a contest, rather like a competitor who competes in a competition. It means struggling to overcome struggles or challenges that hinder you from success or achieving something. "I contend that the sky is blue today" means "I say that the sky is blue today--do you want to dispute that?"
Full of events or incedents
Track and field is a sport comprising various competitive athletic contests based on running, jumping, and throwing.
It means "I do not wish to contest" or "no contest" for short.
It Means Athletics
"Pre" means before.