Bisexuality is a sexual orientation, and bisexual (commonly abbreviated to “bi”) people are those who have the capacity to form attraction and/or relationships to more than one gender.
Biromantic is a romantic orientation in which you can romantically like two or more genders.
The sexual counterpart to biromantic is bisexual. The two differ in that biromantic is the romantic attraction to two or more genders, while bisexual is the sexual attraction to two or more genders. Some individuals are both biromantic and bisexual – meaning they are both romantically and sexually attracted to two or more genders.
Like bisexuality, a biromantic person can also have a preference for and/or lean towards any particular gender.
The “bi” prefix is an umbrella term used for indicating any form of two gender attraction.
Other definitions:
Some people use the word pansexual to describe their attraction to more than one gender. Pansexuality is defined as an attraction to people of any gender or to people regardless of their gender.