1.  systematic(a = adj.all) - characterized by order and planning; "a systematic administrator"; "the investigation was very systematic"
Antonym: unsystematic
Derived form noun system₉

2.  systematic(a = adj.pert) taxonomic, taxonomical - of or relating to taxonomy; "a taxonomic designation"; "taxonomic relations"

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. [1913 Webster]

2.  Proceeding according to system, or regular method; as, a systematic writer; systematic benevolence. [1913 Webster]

3.  Pertaining to the system of the world; cosmical. [1913 Webster]

4.  Affecting successively the different parts of the system or set of nervous fibres; as, systematic degeneration. [1913 Webster]

systematic, adj.
1 methodical; done or conceived according to a plan or system.
2 regular, deliberate (a systematic liar).

Idiom:
systematic theology a form of theology in which the aim is to arrange religious truths in a self-consistent whole.

Derivative:
systematically adv. systematism n. systematist n.

Etymology:
F syst{eacute}matique f. LL systematicus f. late Gk sustematikos (as SYSTEM)

N  order, regularity, uniformity, symmetry, lucidus ordo, music of the spheres, gradation, progression, series, subordination, course, even tenor, routine, method, disposition, arrangement, array, system, economy, discipline orderliness, rank, place, orderly, regular, in order, in trim, in apple-pie order, in its proper place, neat, tidy, en regle, well regulated, correct, methodical, uniform, symmetrical, shipshape, businesslike, systematic, unconfused &c (confuse), arranged, in order, methodically, in turn, in its turn, by steps, step by step, by regular steps, by regular gradations, by regular stages, by regular intervals, seriatim, systematically, by clockwork, gradatim, at stated periods, natura non facit saltum, order is heaven's first law, order from disorder sprung, ordo est parium dispariumque rerum sua loca tribue.

N  arrangement, plan, preparation, disposal, disposition, collocation, allocation, distribution, sorting, assortment, allotment, apportionment, taxis, taxonomy, syntaxis, graduation, organization, grouping, tabulation, analysis, classification, clustering, division, digestion, digest, synopsis, syntagma, table, atlas, file, database, register, organism, architecture, sieve, riddle, screen, sorter, arranged, embattled, in battle array, cut and dried, methodical, orderly, regular, systematic, In vast cumbrous array.