The quality or state of being able to combine or be combined.
From 'combinable' plus the noun suffix '-ity,' which converts adjectives to abstract nouns. Developed in the 19th century as scientific vocabulary for discussing chemical and mathematical properties.
Chemists discuss 'combinability' when figuring out which elements can bond together — it's like asking which puzzle pieces can actually fit, and the answer determines whether you get water or an explosion.
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