1. The close or last part; the end or finish: the conclusion of the festivities.
2. The result or outcome of an act or process: What was the conclusion of all these efforts?
3. A judgment or decision reached after deliberation. See Synonyms at decision.
4. A final arrangement or settlement, as of a treaty.
5. Law The formal closing of a legal complaint or pleading.
a. A proposition that follows from the premises of a formal proof, for instance from the major and minor premises of a syllogism.
b. The proposition concluded from one or more premises; a deduction.
[Middle English conclusioun, from Old French conclusion, from Latin conclūsiō, conclūsiōn-, from conclūsus, past participle of conclūdere, to end; see CONCLUDE.]
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.