London, United Kingdom - April 15, 2025 The United Kingdom’s highest court ruled that the legal definition of “woman” excludes trans women, in a case with sweeping consequences for how equality laws are applied. Britain’s Supreme Court ruled unanimously that the definition of a woman in equality legislation refers to “a biological woman and biological sex,” sparking celebrations outside court among gender-critical campaigners but warnings it was a “worrying” development for transgender people. The case centered on whether trans women with a gender recognition certificate (GRC) – which offers legal recognition of someone’s female sex – are protected from discrimination as a woman under the nation’s Equality Act 2010.