The Collaborative International Dictionary
Synthetic \Syn*thet"ic\, Synthetical \Syn*thet"ic*al\, a. [Gr. ?: cf. F. synth['e]tique.]
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Of or pertaining to synthesis; consisting in synthesis or composition; as, the synthetic method of reasoning, as opposed to analytical.
Philosophers hasten too much from the analytic to the synthetic method; that is, they draw general conclusions from too small a number of particular observations and experiments.
--Bolingbroke. (Chem.) Artificial. Cf. Synthesis, 2.
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(Zo["o]l.) Comprising within itself structural or other characters which are usually found only in two or more diverse groups; -- said of species, genera, and higher groups. See the Note under Comprehensive, 3.
Synthetic language, or Synthetical language, an inflectional language, or one characterized by grammatical endings; -- opposed to analytic language.
--R. Morris.
Wikipedia
In linguistic typology, a synthetic language is a language with a high morpheme-per- word ratio, as opposed to a low morpheme-per-word ratio in what is described as an analytic language. This linguistic classification is largely independent of morpheme-usage classifications (such as fusional, agglutinative, etc.), although there is a common tendency for agglutinative languages to exhibit synthetic properties.
Usage examples of "synthetic language".
It would be a step-by-step operation, the elements of our synthetic language defining themselves as they were transmitted and, we trust, deciphered.
It is a synthetic language, rich with invented words for strange and alien concepts, and with thousands of borrowed words from Sanskrit, Anglish, Old Japanese and, of course, from the various languages of Tlon.
But it would be a good idea to start propagating Esperanto, the synthetic language invented by the Polish oculist, Doctor Zamenhof, in 1887.