Systematical

Definition:

(a.) Of or pertaining to system; consisting in system; methodical; formed with regular connection and adaptation or subordination of parts to each other, and to the design of the whole; as, a systematic arrangement of plants or animals; a systematic course of study.
(a.) Proceeding according to system, or regular method; as, a systematic writer; systematic benevolence.
(a.) Pertaining to the system of the world; cosmical.
(a.) Affecting successively the different parts of the system or set of nervous fibres; as, systematic degeneration.

Compare systematical with other words:

systematic vs. systematical