bi·ped·al·ism

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


Origin:
1905–10; bipedal + -ism

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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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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Cite This Source
00:10
Bipedalism is always a great word to know.
So is interrobang. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes.
Example sentences
Bipedalism is a quintessentially human trait that distinguishes us from other
  primates.
Bipedalism gave us an advantage over our ape cousins in terms of our capacity
  to wander.
It is commonly believed that this led to bipedalism.
The orangutan evidence adds a new twist to the debate of arboreal versus
  terrestrial bipedalism theories.
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