Other forms: yoginis
A yogini in the Western world could be any woman who practices the physical and mental discipline involved in yoga, including meditation and specific postures and stretches.
In English, yogi is sometimes used to refer to an experienced yoga practitioner, regardless of gender, but technically yogi is masculine in gender. This is similar to how "actor" can refer either to men only or to all genders, while "actress" is usually used only for women. Yogi and yogini come from Sanskrit yuj, "to join or unite," and relate to more than just the physical postures that people in the West associate with yoga. A yogini in India could practice a wide variety of spiritual disciplines.