A lesbian is a female human who experiences physical attraction exclusively towards other female humans. In other words: a homosexual female.
This definition has been well-established for decades.
There have been a number of commentators in recent years who have tried to forcibly change this definition. They have tried to change it to ‘a non-man who experiences attraction towards other non-men’.
It is very arrogant to try to forcibly change a definition that has been well-established for a long time. This forcible change is also motivated by the desire to make it harder for homosexual females to identify themselves (by removing a word they use to do so). It is ultimately motivated by a hatred of homosexuality among those who believe in Gender Ideology.