Quick and basic reference site for definitions and synonyms.
By using One Look, you can search several dictionaries, including specialty dictionaries, at once.
Links to specialized subject dictionaries, some of which include dialects, professions, and finance.
With its goal to provide as much information as possible, Wordnik offers much more than definitions, including definitions, synonyms, antonyms, example sentences, related words, images, audio pronunciations, etymology, and more.
“The Encyclopedia will be an online reference and database on all 1.9 million species currently known to science and will stay current by capturing information on newly discovered and formally described species. The Encyclopedia of Life will help all of us better understand life on our planet.”
Online version of the print encyclopedia that combines text, images, audio, multimedia, essays, and interactive maps to “stimulate readers to think differently about Chicago – by walking new paths through history.”
InfoPlease is the source to go to with factual questions. With its encyclopedia, almanac, dictionary, and more, InfoPlease can help answer your basic questions.
“Wolfram Alpha introduces a fundamentally new way to get knowledge and answers—not by searching the web, but by doing dynamic computations based on a vast collection of built-in data, algorithms, and methods.” It is useful for finding technical or scientific information.
“As the U.S. government's official web portal, USA.gov makes it easy for the public to get U.S. government information and services on the web.”
The Central Intelligence Agency’s World Fact Book provides up-to-date information about countries and regions around the world, including history, people, geography, and economics, to help form a complete portrait of each country.
The source to learn about hundreds of different kinds of jobs with information about training and education, earnings, expectations of workers, and more.