What is the meaning of tema or theme?
It means:
-The subject of a talk, a piece of writing, a person's thoughts, or an exhibition; a topic: "the theme of the sermon was reverence".
-The first major constituent of a clause, indicating the subject-matter, typically being the subject but optionally other constituents, as in “poor he is not.”
-An idea that recurs in or pervades a work of art or literature.