IPA: //roʊˈteɪtəri//
KK: /roʊˈteɪtəri/
Relating to or causing something to turn around a central point or axis.
The rotatory motion of the wheel helps the vehicle move forward.
Rotatory → It is formed from "rotare" (meaning to turn or rotate) and the suffix "-ory" (meaning relating to or characterized by). The word "rotatory" refers to something that is characterized by or relating to rotation or turning.
Think of 'rotare' meaning to 'turn' — that's why 'rotatory' describes something that is related to turning or rotating.