Real, precise, polysyllabic nouns still available on the .com are rare, and the remaining ones are usually awkward or obscure. This is neither: uncommon but transparent, understood immediately by anyone reading it. Expansibility is the property of being able to expand, a genuine term in physics and materials science describing how substances behave under heat and pressure, with an obvious metaphorical use in business. That double life gives it range. A materials science company, an engineering consultancy or a technical product on one side.