a. A journey, especially an arduous or hazardous one, undertaken with extensive planning and a definite objective: an expedition against the enemy stronghold; a scientific expedition to the South Pole.
b. The people undertaking such a journey, considered as a group.
2. An outing undertaken with a definite objective: a shopping expedition.
3. Speed or promptness in performance. See Synonyms at haste.
[Middle English expedicioun, military campaign, from Old French expedition, from Latin expedītiō, expedītiōn-, from expedītus, past participle of expedīre, to make ready; see EXPEDITE.]
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.