Nick C. Ellis, Ute Römer, and Matthew Brook O’Donnell present a view of language as a complex adaptive system that is learned through usage. In a series of research studies, they analyze Verb-Argument Constructions (VACs) in first and second language learning, processing, and use. Drawing on diverse epistemological and methodological perspectives, they show how language emerges out of multiple experiences of meaning-making. In the development of both mother tongue and additional languages, each usage experience affects construction knowledge following general principles of learning relating to frequency, contingency, and semantic prototypicality. The implications of this work will be of value to students and scholars from a wide range of disciplinary interests in language and learning.