thetic
adjective
thet·ic ˈthe-tik 
ˈthē-
: constituting or beginning with a poetic thesis
a thetic syllable
thetically
ˈthe-ti-k(ə-)lē
adverb ˈthē-
Word History
Etymology
Greek thetikos of a proposition, from tithenai to lay down — more at do
First Known Use
1815, in the meaning defined above