The word 'titular' traces its lineage directly to the Latin noun titulus, which signified an inscription, label, or placard bearing a name. This evolved into the Old French title and then Middle English 'title', referring to a descriptive name or designation of rank. The adjective-forming suffix -ar (from Latin -aris) was appended to create 'titular', literally meaning "of or pertaining to a title." The modern sense, particularly the notion of holding a title in name only without its attendant authority, developed from the understanding that the label (titulus) could exist independently of the substance it originally represented.

Structure: titul (title) + ar (adjective suffix) - titul: From Latin titulus (title, inscription, label). - ar: A Latin-derived suffix forming adjectives, often via Old French -aire or Latin -aris.