Why this word is great
COMMENSURABILITY — [Noun] The quality of being measurable or comparable by a shared standard. From French commensurabilité, from Late Latin commensurabilis ("measurable by a common standard"), from com- ("with") + mensurabilis ("measurable"). Unlike incommensurability (which speaks to the absence of a common measure) or comparability (which merely suggests the possibility of comparison), commensurability insists on a precise, quantifiable alignment. It is the golden ratio in architecture, the exchange rate between currencies, or the way a baker knows exactly how much flour balances an egg—a rare and fleeting harmony in a world that resists neat equations.