Definition of "thema"

Eco has his own image for this method-spiral repetition: every new exploration elevates the solutions to a higher level by expanding the thema's cognitive context.

1997, Rocco Caopzzi, Reading Eco: An Anthology, page 111

With regard to its division—which is the second main section [of this treatise]—one must diligently examine the meaning of the words that appear in the thema.

2013, Siegfried Wenzel, The Art of Preaching, page 151