Language acquisition research frequently concerns itself with linguistic development and result of the acquisition process with respect to a first or subsequent language. For some, it seems tacitly assumed that a first language, once acquired, remains stable, regardless of exposure to and the acquisition of additional language(s) beyond the first…

This article first introduces some theoretical considerations concerning the emergence and evolution of sign languages from the semiogenetic perspective. It then presents results from a linguistic study of the phenomenon of lexical stabilization in three emerging sign languages used by Brazilian deaf adults who live in a hearing environment…