a. A regional or social variety of a language distinguished by pronunciation, grammar, or vocabulary, especially a variety of speech differing from the standard literary language or speech pattern of the culture in which it exists: Cockney is a dialect of English.
b. A variety of language that with other varieties constitutes a single language of which no single variety is standard: the dialects of Ancient Greek.
2. The language peculiar to the members of a group, especially in an occupation; jargon: the dialect of science.
3. The manner or style of expressing oneself in language or the arts.
4. A language considered as part of a larger family of languages or a linguistic branch. Not in scientific use: Spanish and French are Romance dialects.
[French dialecte, from Old French, from Latin dialectus, form of speech, from Greek dialektos, speech, from dialegesthai, to discourse, use a dialect : dia-, between, over; see DIA- + legesthai, middle voice of legein, to speak; see leg- in the Appendix of Indo-European roots.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2016 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
The American Heritage Dictionary Blog
Check out our blog, updated regularly, for new words and revised definitions, interesting images from the 5th edition, discussions of usage, and more.
American Heritage Dictionary Products
The American Heritage Dictionary, 5th Edition
The American Heritage Dictionary of Idioms
The American Heritage Roget's Thesaurus
Curious George's Dictionary
The American Heritage Children's Dictionary
The American Heritage Dictionary of Indo-European Roots
The American Heritage Student Grammar Dictionary
The American Heritage Desk Dictionary + Thesaurus
The American Heritage Science Dictionary
The American Heritage Dictionary of Business Terms
The American Heritage Student Dictionary
The American Heritage Essential Student Thesaurus