bipedalism

[ bahy-ped-l-iz-uh m ]
/ baɪˈpɛd lˌɪz əm /

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] /ˌbaɪ pɪˈdæl ɪ ti/.

Origin of bipedalism

First recorded in 1905–10; bipedal + -ism