rotation; spin
Example sentences
地球の自転が止まったら、いったいどうなるんだろう。
What would happen supposing the earth stopped spinning?
地球が自転しているのは常識だ。
It's common knowledge that the earth turns on its axis.
仮に地球が自転をやめれば、どうなると思いますか。
Were the earth to stop revolving, what do you suppose would happen?