The word "substitution" has a clear logical construction from its Latin components. It originates from the Latin verb substituere, meaning "to put in place of," which itself is a compound of sub- (under, in place of) and statuere (to set up, place). The core concept is of placing one thing under or instead of another, establishing a replacement. The suffix -ion was added to form a noun describing the action or result of this act of replacement. Thus, the modern abstract meaning of "the act of putting one person or thing in the place of another" flows directly from this literal morphemic sequence of "placing-under" or "setting-in-place-of."

Structure: sub (under, in place of) + stitut (set, place) + ion (action or state) - sub: A Latin prefix meaning "under, below, in place of." - stitut: From the Latin root statuere (to set up, place, establish), a frequentative form of stare (to stand). - ion: A suffix of Latin origin forming nouns denoting action or condition.