The 14th century, especially with reference to Italian art and literature.
[Italian, from (mil) trecento, (one thousand) three hundred : tre, three (from Latin trēs; see trei- in the Appendix of Indo-European roots) + cento, hundred (from Latin centum; see dek in the Appendix of Indo-European roots).]
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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.