bipedalism

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


Origin:
1905–10; bipedal + -ism

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Dictionary.com'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
Dictionary.com's 21st Century Lexicon
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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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