General Reference: Acronyms, Dictionaries, & Thesauri
A searchable database containing more than 47,000 acronyms and abbreviations about all subjects, the content on this site focuses on computers, technology, telecommunications, the government, and the military.
World Wide Web Acronym and Abbreviation Server
Providing a list of acronyms and abbreviations, searchable by keyword, this site is frequently updated. Users are encouraged to suggest new acronyms for inclusion.
From Lexico LLC, this site provides access to an English-language dictionary, foreign-language dictionaries, translator dictionaries, Roget's Thesaurus, writing resources, and "Word of the Day."
Searchable version of the 160,000-entry, English-language dictionary, this resource also includes an online thesaurus and links to related sites.
More than 2,600,000 words in 580 dictionaries may be searched simultaneously through this site's common interface.
Online Etymology Dictionary
This site lists the origin and first written usage for thousands of words in the English language. One may either browse alphabetical sections of words or search for a specific word.
The Semantic Rhyming Dictionary
Useful for writing poetry, song lyrics, greeting cards, and witticisms, this site allows the user to find rhymes, semantic siblings, synonyms, and homophones.
Webster's Revised Unabridged Dictionary (1913)
The online version of this historic dictionary is produced by the ARTFL Project at the University of Chicago.
Roget's II: The New Thesaurus
From Bartleby.com, the searchable content of the 1995 edition of Roget's II allows access to 35,000 synonyms and 250,000 cross-references.
From Lexico LLC, this site is an online version of Roget's Thesaurus of English Words and Phrases.