the condition of being two-footed or of using two feet for standing and walking.
Also, bipedality [bahy-pi-dal-i-tee] .

1905–10; bipedal + -ism Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To bipedalism's 21st Century Lexicon
Main Entry:  bipedalism
Part of Speech:  n
Definition:  the condition of having two feet for walking; also, walking upright on two feet
Usage:  bipedal adj's 21st Century Lexicon
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Cite This Source
Example sentences
The origins of human bipedalism have long occupied paleontologists.
Bipedalism gave us an advantage over our ape cousins in terms of our capacity
  to wander.
In fact, of course, bipedalism is nothing remarkable or unique anyway.
The orangutan evidence adds a new twist to the debate of arboreal versus
  terrestrial bipedalism theories.
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