a. Reasoning based on inconclusive evidence; conjecture or supposition.
b. A conclusion, opinion, or theory reached by conjecture.
c. Archaic Contemplation or consideration of a subject; meditation.
a. Engagement in risky business transactions on the chance of quick or considerable profit.
b. A commercial or financial transaction involving speculation.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2019 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.