The word 'unction' originates from the Latin unctio, meaning "an anointing," which itself derives from the verb unguere, "to anoint or smear." This Latin root can be traced further back to the Proto-Indo-European root ongw-, meaning "to salve, anoint," which also gave rise to words like 'unguent.' The core concept of applying an oily substance evolved from a literal, physical act—central to ancient religious, medicinal, and cosmetic practices—into a more abstract meaning. In its modern religious sense, it retains the literal meaning of an anointing ritual, while its secondary meaning, referring to excessively soothing or flattering speech, is a figurative extension, suggesting language that is as smooth and slick as oil.

Structure: unct (anoint) + ion (noun suffix) unct (Latin, from the past participle stem of unguere, meaning "to anoint, to smear"); ion (Latin, a suffix forming nouns of action or state)