1. (noun) An "educational" tool created to thoroughly confuse learners. Its arbitrary and ambiguous nature not only defeats its supposed purpose as a memory aid, but also allows the "educator" to raise or lower grades based on this elusive "concept".
2. + ous (adj.) Can also be used to describe something devious and/or superfluous.
(2) T.'s use of stink bombs to drive out her roommate was completely Quadrant Systemous.