This textbook takes a broad perspective on multilingualism, using a sociolinguistics and acquisition-informed approach that treats multilingualism not solely as the mastery of two or more well-defined language systems, but rather as a continuum of linguistic repertoires and resources to be used in different settings and combinations. The authors introduce traditional aspects of multilingualism - including historical dimensions, societal and individual multilingualism, aspects of identities, ideologies, education, and language policies - before going on to examine newer manifestations such...