The Geography of Language. Chapter 8. Defining Language. Language: a systematic means of communicating ideas or feelings by the use of conventionalized signs, gestures, marks or especially articulate vocal sounds.
Language Families are thought to have a shared, but fairly distant, origin in a language subfamily
Subfamily: are divided into language groups, which consist of sets of individual languages.
Dialect: It is the distinction between a language and a dialect is not always clear. Can generally be thought of as regional variants of a standard language.