the meaning of dissertation
A dissertation is a subject you chose for yourself. The first usage of the word in the English language in 1651 also gives a useful starting definition: “an extended written treatment of a subject”.
Another useful clue is found in the Latin origin of the word – dissertation comes from a Latin word ‘dissertare’ = ‘to debate’.
In the appendix there is a dissertation on the Negro in American fiction.
Perhaps it was his Dissertation that Mendelssohn’s children would read.