How a battle over what it means to be woman ended up in the UK’s highest court

In the UK’s highest court, lawyer Aidan O’Neill argued that sex is an “immutable biological state” while representing campaigners in Scotland challenging the definition of what it means to be female under the 2010 Equality Act. The case will determine if trans women should be considered female based on their biological sex or gender identity, potentially impacting single-sex spaces and human rights. Mr. O’Neill urged the court to prioritize biological reality over legal fiction and uphold the appeal, emphasizing the ordinary understanding of sex in everyday language and situations.

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