Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English

  

Cambridge Academic Content Dictionary

With comprehensive coverage of key academic terms as well as a broad range of everyday meanings, this monolingual dictionary is perfect for intermediate and upper-intermediate students of American English.

Cambridge Academic Content Dictionary is the best dictionary for general American English on Cambridge Dictionaries Online. Select "American English" from the list of dictionaries at the top of any page on Cambridge Dictionaries Online to search this dictionary.

Favorite Entries

Key Features

More than 2,100 key words and meanings from the U.S. content areas

Words and meanings from U.S. and world history, English, algebra, geometry, art, biology, chemistry, earth science, physics, and other content areas are clearly labelled and explained. These can be main entries, such as hadron (from physics). Or they can be special meanings of more common words, such as the sense of line used in geometry.

Learn how to use the word

Thousands of natural example sentences show words in context: At assign, the examples show that people can be assigned jobs, people can be assigned to a place, and things can be assigned to people.

American Pronunciation

Hear the words spoken online with thousands of American English recordings: Try listening to the different pronunciations for the "control" sense of lead and the "metal" sense of lead.

Also available as a book

Get the Cambridge Academic Content Dictionary from Cambridge ESL.

  • Includes more than 60,000 easy-to-understand definitions and useful examples.
  • Highlights common mistakes through Usage, Grammar, and Spelling notes.
  • Expands vocabulary using Word Family and Word Choices boxes.
  • 20 Reference Pages cover place names, measurements, prefixes and suffixes, irregular verbs, punctuation, math and science symbols, biological classification, the periodic table, geologic time, a glossary of literary terms, and more.

Other dictionaries

In other dictionaries...

“expenditure” in other dictionaries

If you search for a word, then decide you want to see what another Cambridge dictionary says about it, you can use the ‘In other dictionaries’ section on the right.

For example if you look up the definition for expenditure in British English, then want to find out what the American English dictionary says, click on ‘American English’. If you then want to find a Spanish translation for that word, click on ‘in Spanish’.

Word of the Day

navigate

to direct the way that a ship, aircraft, etc. will travel, or to find a direction across, along, or over an area of water or land, often by using a map

Word of the Day

Blog

Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More