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

code (kōd)
Share:
n.
1.
a. A system of signals used to represent letters or numbers in transmitting messages.
b. A system of symbols, letters, or words given certain arbitrary meanings, used for transmitting messages requiring secrecy or brevity.
c. An access code.
d. A special command, such as a sequence of keystrokes, that allows a user to activate a hidden or accidental feature in a computer program or video game.
2.
a. The information that constitutes a specific computer program.
b. A system of symbols and rules that serve as instructions for a computer.
3. Genetics The genetic code.
4.
a. A systematically arranged and comprehensive collection of laws.
b. A systematic collection of regulations or rules of procedure or conduct: a building code.
5. Medicine Code blue.
6. Slang A patient whose heart has stopped beating, as in cardiac arrest.
v. cod·ed, cod·ing, codes
v.tr.
1. To convert (a message, for example) into code.
2. To systematize and arrange (laws and regulations) into a code.
3. To assign a code to (something) for identification or classification: coded each response to the survey by age and gender.
4. To express or convey (words) in a manner that implies a different meaning: a novel that codes references to a character's sexuality in descriptions of clothing.
v.intr.
1. Genetics
a. To specify the genetic code for an amino acid or a polypeptide: a gene that codes for an enzyme.
b. To specify the genetic code for a trait or characteristic: a gene that codes for red hair.
2. Computers To write or revise a computer program.
3. Slang To go into cardiac arrest.

[Middle English, from Old French, from Latin cōdex, book; see CODEX.]

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.