1. The practice of athletic exercises.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• athletiism,
• atleticism,
• atheletisism,
• athleticsm,
• athleticim,
• athletasism,
• athletecism,
• athelticism,
• athleticisim,
• athletisism,
• athletcis,
• athletism,
• athletisicm,
• athletisim,
• atheleticism,
• athletcism,
• athlettism,
• athyeoidism,
• athlectism,
• athlecticsm

• athletic,
• ateleiotic,
• athletic sock,
• athletic field,
• athletics,
• athletic game,
• athletic type,
• athletic wear.

The adjective form of "athleticism" is "athletic".

The plural form of the word "athleticism" is "athleticisms".

The singular form of the word "athleticism" is "athleticism".