tit ‧ u ‧ lar /ˈtɪtʃələ, ˈtɪtʃʊlə $ -ər/ BrE AmE adjective [only before noun]
[ Date: 1500-1600 ; Language: Latin ; Origin: titulus ; ⇨ ↑ title ]
titular head/leader/monarch etc someone who is the official leader or ruler of a country but who does not have real power or authority