n. pl. syn·the·ses (-sēz′)
a. The combining of separate elements or substances to form a coherent whole.
b. The complex whole so formed.
2. Chemistry Formation of a compound from simpler compounds or elements.
a. Reasoning from the general to the particular; logical deduction.
b. The combination of thesis and antithesis in the Hegelian dialectical process whereby a new and higher level of truth is produced.
[Latin, collection, from Greek sunthesis, from suntithenai, to put together : sun-, syn- + tithenai, to put; see dhē- in the Appendix of Indo-European roots.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.