Etymology tree
Proto-Indo-European *h₂weh₁-der.
Proto-Indo-European *-tḗr
Proto-Indo-European *-tromder.
Ancient Greek ἆθλον (âthlon)
Ancient Greek ᾱ̓θλέω (āthléō)
Proto-Hellenic *-tās
Ancient Greek -τής (-tḗs)
Ancient Greek ἀθλητής (athlētḗs)bor.
Latin āthlētalbor.
Portuguese atleta
Learned borrowing from Latin āthlēta, borrowed from Ancient Greek ἀθλητής (athlētḗs), from ᾱ̓θλέω (āthléō) + -τής (-tḗs).