Lemma and Rubric

Lemma noun - A subsidiary proposition that is assumed to be true in order to prove another proposition.

Rubric and lemma are semantically related. in title topic. In some cases you can use "Rubric" instead a noun "Lemma".

Rubric noun - A word or series of words often in larger letters placed at the beginning of a passage or at the top of a page in order to introduce or categorize.

Lemma and rubric are semantically related. Sometimes you can use "Lemma" instead a noun "Rubric".