Our chapter discusses the evolution of societal understanding and acceptance of gender diversity, moving beyond the traditional male-female binary to include non-binary identities. It emphasizes the fluid nature of gender, with individuals experiencing shifts in their gender identity or existing outside binary norms. The chapter explores this transformation from two perspectives: linguistic and legal analysis. The linguistic aspect examines how language in everyday and legal contexts reflects and facilitates this journey towards gender inclusivity, while the legal analysis delves into the adaptation of laws and legal and administrative frameworks to protect and legitimize these evolving gender identities. The combination of these perspectives aims to deepen the understanding of gender fluidity and suggest pathways for further progress and inclusion.