having, showing, or involving a system, method, or plan: a systematic course of reading; systematic efforts.
given to or using a system or method; methodical: a systematic person.
arranged in or comprising an ordered system: systematic theology.
concerned with classification: systematic botany.
pertaining to, based on, or in accordance with a system of classification: the systematic names of plants.
Also, systematical.

1670–80; < Late Latin systēmaticus < Greek systēmatikós, equivalent to systēmat- (stem of sýstēma) system + -ikos -ic

systematicness, noun
systematically, adverb
intersystematic, adjective
intersystematical, adjective
intersystematically, adverb
nonsystematic, adjective
nonsystematical, adjective
nonsystematically, adverb
oversystematic, adjective
oversystematicness, noun
oversystematically, adverb
presystematic, adjective
presystematically, adverb
quasi-systematic, adjective
quasi-systematically, adverb
unsystematic, adjective
unsystematical, adjective
unsystematically, adverb

systematic, systemic.

2. See orderly. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
systematic (ˌsɪstɪˈmætɪk)
1.  characterized by the use of order and planning; methodical: a systematic administrator
2.  comprising or resembling a system: systematic theology
3.  biology Also: systematical of or relating to the taxonomic classification of organisms

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1670s, from L.L. systematicus, from Gk. systematikos, from systema (see system).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Though his reading was various, it was neither purposeless nor unsystematic.
After unsystematic and systematic risk, another kind of risk, systemic risk is
  part of the overall picture.
The creative-writing program, unsystematic or even anti-system as it might
  believe itself to be, is a system.
The science of surfers is not pure but heavily applied--and completely
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