Where does “pentatlon” come from?

pentatlon (Romanian) comes from French pentathlon, from Ancient Greek πένταθλον, from Ancient Greek πεντα-, from Ancient Greek πέντε, from Proto-Hellenic pénkʷe, from Proto-Indo-European pénkʷe — five.

pentatlon (Romanian): pentathlon

Definitions

pentathlon

Ancestry of “pentatlon”, step by step

Step	Language	Word	Meaning
1	French	pentathlon	pentathlon (discipline made up of five events)
2	Ancient Greek	πένταθλον	the contest of the five exercises, pentathlon
3	Ancient Greek	πεντα-	penta-, five; five
4	Ancient Greek	πέντε	five
5	Proto-Hellenic	pénkʷe	five
6	Proto-Indo-European	pénkʷe	five

Words derived from “pentatlon”

pentatlonist
heptatlon
pentatlonistă

Every word from Proto-Indo-European pénkʷe →Every word from Ancient Greek πεντα- →Every word from Proto-Hellenic pénkʷe →