from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A comprehensive treatise, especially in philosophy or theology.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A comprehensive summary of, or treatise on a subject, especially theology or philosophy.
Medieval Latin, from Latin, the whole; see sum1.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin summa. (Wiktionary)