The word 'valuable' is built on the Latin verb valere, which originally meant "to be strong, to be powerful." This sense of inherent strength evolved in Late Latin and Old French to denote worth or value, particularly in an economic sense. The suffix -able, indicating fitness or capacity, was attached to the root to create an adjective meaning "capable of being valued" or "having worth." Over time, the meaning solidified to describe objects of high monetary worth and, more abstractly, things of great usefulness or importance, thus connecting the ancient concept of strength directly to modern notions of value.

Structure: valu (worth) + able (capable of) - valu: From Latin valere (to be strong, be worth), via Old French valoir. In this word, it functions as the core root meaning "worth". - able: From Latin -abilis (capable of, fit for), via Old French -able. It is a suffix forming adjectives meaning "capable of being" or "worthy of being".