Judges say the "concept of sex is binary" while adding that transgender people will still have protection against discrimination.

The United Kingdom's top court will issue a ruling on Wednesday on the legal definition of a woman under equality laws, a case that could have far-reaching implications for the fractious debate over transgender rights.

LONDON -- The Supreme Court ruled Wednesday that the U.K. equalities law defines a woman as someone born biologically female. Justice Patrick Hodge said five judges at the court had ruled unanimously that “the terms ‘woman’ and ‘sex’ in the Equality Act refer to a biological woman.”