Under gender identity legislation in many jurisdictions, a woman is defined as someone who identifies as a woman. This approach represents a significant shift from traditional legal frameworks that relied primarily on biological characteristics or birth-assigned gender.

Legal frameworks increasingly recognise that gender identity centres on an individual's internal sense of self rather than external judgement or physical characteristics. Australia's Sex Discrimination Act exemplifies this approach by providing legal protection based on a person's self-identified gender, regardless of whether they have undergone medical transition or changed their legal documents. This recognition acknowledges that gender identity represents a deeply personal experience that deserves both respect and legal protection.

Research consistently demonstrates that forcing individuals to live as a gender that conflicts with their internal sense of self can cause significant psychological distress. Evidence from healthcare and legal professionals indicates that self-identification frameworks better protect people's fundamental rights while reducing discrimination and improving wellbeing outcomes.

These legal definitions continue to evolve across different jurisdictions, with some countries and states adopting self-identification principles while others maintain different criteria. Understanding your local legal framework remains important, as definitions and protections can vary significantly depending on your location and the specific legal context involved.