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

pen 1 (pĕn)
Share:
n.
1. An instrument for writing or drawing with ink or similar fluid, especially:
a. A ballpoint pen.
b. A fountain pen.
c. A pen point.
d. A penholder and its pen point.
e. A quill.
2.
a. An instrument for writing regarded as a means of expression: "Tyranny has no enemy so formidable as the pen" (William Cobbett).
b. A writer or an author: a hired pen.
c. A style of writing: wrote plays with a witty pen.
3. A pen-shaped device containing something other than ink: an insulin pen; a vaporizer pen.
4. Any of various other pen-shaped devices, such as a laser pointer.
5. The chitinous internal shell of a squid.
6. A pen shell.
7. pens Archaic The primary feathers or wings of a bird.
tr.v. penned, pen·ning, pens
To write or compose: penned a letter.

[Middle English penne, from Old French, from Late Latin penna, from Latin, feather; see pet- in the Appendix of Indo-European roots.]

penner n.

The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. All rights reserved.
 
pen 2 (pĕn)
Share:
n.
1.
a. A fenced enclosure for animals.
b. The animals kept in such an enclosure.
c. Any of various enclosures, such as a bullpen or playpen, used for a variety of purposes.
2. A roofed dock for submarines.
tr.v. penned or pent (pĕnt), pen·ning, pens
To confine in or as if in a pen. See Synonyms at enclose.

[Middle English, from Old English penn.]

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.