Regional Variation
Idiolect – the form of language spoken by one person Dialect – uniformity in language within a certain group Accent – differences in pronunciation

Mutual intelligibility – if speakers of one language variety can understand speakers of another language variety and vice versa

Origins of language variation Isoglosses – lines on a map that separate dialectical boundaries

Types of variation

Dialectology – study of linguistic variation in terms of the geographical distribution of speakers Atlas maps – produced by computers to plot features that distinguish one group from another English in North America