use-icon

HOW TO USE THE DICTIONARY

To look up an entry in The American Heritage Dictionary of the English Language, use the search window above. For best results, after typing in the word, click on the “Search” button instead of using the “enter” key.

Some compound words (like bus rapid transit, dog whistle, or identity theft) don’t appear on the drop-down list when you type them in the search bar. For best results with compound words, place a quotation mark before the compound word in the search window.

guide to the dictionary

use-icon

THE USAGE PANEL

The Usage Panel is a group of nearly 200 prominent scholars, creative writers, journalists, diplomats, and others in occupations requiring mastery of language. Annual surveys have gauged the acceptability of particular usages and grammatical constructions.

The Panelists

open-icon

AMERICAN HERITAGE DICTIONARY APP

The new American Heritage Dictionary app is now available for iOS and Android.

scroll-icon

THE AMERICAN HERITAGE DICTIONARY BLOG

The articles in our blog examine new words, revised definitions, interesting images from the fifth edition, discussions of usage, and more.

100-words-icon

See word lists from the best-selling 100 Words Series!

Find out more!

open-icon

INTERESTED IN DICTIONARIES?

Check out the Dictionary Society of North America at http://www.dictionarysociety.com

ex·er·cise (ĕksər-sīz′)
Share:
n.
1.
a. Activity that requires physical or mental exertion, especially when performed to develop or maintain fitness: walks every day for exercise.
b. A specific activity performed to develop or maintain fitness or a skill: sit-ups and other exercises; a piano exercise.
2.
a. The active use or application of something: the exercise of good judgment.
b. The discharge of a duty, function, or office.
3. An activity having a specified aspect: an undertaking that was an exercise in futility.
4. A military maneuver or training activity.
5. exercises A ceremony that includes speeches, presentations, and other activities: graduation exercises.
v. ex·er·cised, ex·er·cis·ing, ex·er·cis·es
v.tr.
1.
a. To subject to practice or exertion in order to train, strengthen, or develop: exercise the back muscles; exercise the memory.
b. To put through exercises: exercise a platoon. See Synonyms at practice.
2.
a. To make active use of; employ, apply, or exert: exercise restraint; exercise control.
b. To discharge (duties, for example).
3.
a. To carry out the functions of: exercise the role of disciplinarian.
b. To execute the terms of (a stock option, for example).
4. To alarm, worry, or anger; upset: an injustice that exercised the whole community.
v.intr.
To engage in exercise.
[Middle English, from Old French exercice, from Latin exercitium, from exercitus, past participle of exercēre, to exercise : ex-, ex- + arcēre, to restrain.]
exer·cis′a·ble adj.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. 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:

    Indo-European Roots

    Semitic Roots

    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.

American Heritage Dictionary Products