Definition of bipedalism in US English:

bipedalism

noun

Zoology
  • See bipedal

    • ‘But bipedalism in birds is a highly specialized form of bipedal motion; the large tails of birds' ancestors, which in crocodilians still anchor the leg muscles, have mostly vanished in birds.’
    • ‘One of the pleasures of Stanford's book is its splendidly gossipy account of recent research into the early history of hominid bipedalism.’
    • ‘They concluded that movement by the protohominids into this novel dimension of behavior was importantly linked with the advent of bipedalism.’
    • ‘An opposing camp argues that bipedalism is simply the most energy-efficient way for a hominid to get around on a flat surface.’
    • ‘Well, it is clear that bipedalism arose quite early in hominid history, even if no one can be certain, in the strictest genealogical sense, that the earliest hominid was an upright biped.’

Pronunciation

bipedalism

/bīˈpedlˌizəm/