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

ob·serve (əb-zûrv)
Share:
v. ob·served, ob·serv·ing, ob·serves
v.tr.
1.
a. To be or become aware of, especially through careful and directed attention; notice: observed a car leaving the property.
b. To watch attentively: observe a child's behavior.
c. To make a systematic or scientific observation of: observe the orbit of a comet.
2. To say casually; remark: "'It's nice to have somebody to wait on you,' she observed, with a laugh" (Upton Sinclair).
3.
a. To adhere to or abide by; comply with: observe the terms of a contract.
b. To act in acknowledgment of (a holiday, for example); keep or celebrate: observe an anniversary.
c. To maintain (silence or a period of silence), as out of respect for someone who has died.
v.intr.
1. To take notice: stood by the window observing.
2. To say something; make a comment or remark: observed upon the unusual weather.
3. To watch or be present without participating actively: We were invited to the conference solely to observe.

[Middle English observen, to conform to, from Old French observer, from Latin observāre, to abide by, watch : ob-, over; see OB- + servāre, to keep, watch; see ser-1 in the Appendix of Indo-European roots.]

ob·serving·ly adv.

Synonyms: observe, keep, celebrate, commemorate, solemnize
These verbs mean to give proper heed to or show proper reverence for something, such as a custom or holiday. Observe and keep stress compliance or respectful adherence to that which is prescribed: observes the Sabbath; keeps the holiday traditions. Celebrate emphasizes observance in the form of rejoicing or festivity: a surprise party to celebrate her birthday. To commemorate is to honor the memory of a past event: a ceremony that commemorated the career of a physician. Solemnize implies dignity and gravity in the celebration of an occasion: solemnized the funeral with a 21-gun salute. See Also Synonyms at see1.

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.