The word 永久性 (yǒngjiǔxìng), meaning "permanence" or "permanent nature," is a logical compound formed through a standard Chinese morphological process. It begins with the adjectival root 永久 (yǒngjiǔ), itself a compound of 永 ("perpetual") and 久 ("long-lasting"), which together mean "enduring" or "permanent." The suffix 性 (xìng), meaning "nature," "property," or "-ity," is then added to nominalize the adjective, transforming the descriptive concept of "permanent" into the abstract noun "permanence." Thus, the formation follows the common pattern of [Descriptive Root] + [Nominalizing Suffix] to create a term for an inherent quality or state.