dialect
A dialect is a particular flavor of a language — the version spoken by people in one region or one social group, with its own words, its own sounds, and even its own small twists of grammar. Think of how a Texan, a Londoner, and a Scot all speak English, yet say it differently: one orders "soda," another "fizzy drink," and the vowels and rhythms shift the moment they open their mouths. Each is speaking a dialect of English.
Crucially, no dialect is more "correct" than another. The version we call the "standard" — the one taught in schools and read on the news — is usually just the dialect that happened to belong to the people with power and prestige. It is not purer or more logical; it simply won the social lottery. Every dialect has a full, consistent grammar of its own.
Here is the slippery part: where does a dialect end and a separate language begin? Linguists love the quip that "a language is a dialect with an army and a navy." Mandarin and Cantonese are often called dialects of Chinese though their speakers can't understand each other, while Norwegian and Swedish are called separate languages though their speakers largely can. The line is drawn by politics and identity far more than by linguistics.
"A language is a dialect with an army and a navy." — a popular linguists' quip on how political power, not grammar, decides the label.
Often attributed to linguist Max Weinreich, who reported it from an audience member.
The word comes from the Greek diálektos, "way of speaking" or "discourse." One caution: an accent is not the same as a dialect — an accent is only the pronunciation part, the sounds, while a dialect also carries its own vocabulary and grammar. Linguists use "mutual intelligibility" — whether two speakers can understand each other — as a rough test for one language versus two, but it's only a guideline: dialects often shade gradually into one another across a region, a continuum with no sharp border.