The state of being an athlete, or of taking part in athletic events.(noun)
A show of athletic prowess.(noun)
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Use "athleticism" in a sentence
"Now, do you think "athleticism" is a useful explanation for our observation of fast running?"
"But in your new test, as you attempt to make it match my very poor and disappointing Poindexter case, 'athleticism' is not intended to explain an observation of fast running."
"And you still haven't begun to tell me why offering "athleticism" is any more subjective or meaningless an explanation for some phenomenon than offering "intelligence"."