The quality or state of being unchanging, permanent, or firmly established; lack of movement or flexibility.
From Latin 'fixus' (fixed) plus '-ity' (state of being). Used since the 1600s in scientific and philosophical writing.
The philosopher Judith Butler used 'fixity' to explain why people think gender is unchangeable—our language makes permanent categories sound natural, but biology shows bodies have far more flexibility than our words suggest.
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