Webster's Revised Unabridged Dictionary · 1913

Systematic

Systematic , adjective

1.
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.
Now we deal much in essays, and unreasonably despise systematical learning; whereas our fathers had a just value for regularity and systems. — I. Watts
A representation of phenomena, in order to answer the purposes of science, must be systematic. — Whewell
2.
Proceeding according to system, or regular method; as, a systematic writer; systematic benevolence.
3.
Pertaining to the system of the world; cosmical.
These ends may be called cosmical, or systematical. — Boyle
4.
(Medicine) Affecting successively the different parts of the system or set of nervous fibres; as, systematic degeneration.
Collocations (1)
Systematic theology , See under Theology.

Also: Systematical