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(1) The act of being a pedestrian as a way of thinking and being.

(2) An act committed whilst being a pedestrian (Kind of like terrorism)
(1) "I was thinking of starting the first church of Pedestrianism"

(2) When he walked infront of a car, the newspapers reported it only as a 'pedestrianism'
by Haydenem April 15, 2006
The practice of walking.
That kid practices pedestrianism
by KNZR March 08, 2008