Abstract In this article a series of Arabic terms that refer to language variability will be discussed. The basic principle of the analysis is that these terms are explicitly or implicitly informed by language ideological attitudes concerning linguistic variability in Arabic in which a diglossic division is taken for granted. Because of its common-sense and taken-for-granted nature, (language) ideology tends to be located much more in the unsaid than in what is overtly voiced. At first sight, linguistic terminology might seem straightforward and explicit. However, especially if the terms involved are commonly used, they tend to cover a set of shared attitudes toward language and language use. A study of the terminology regarding language variability, then, can be very productive in uncovering implicit assumptions concerning linguistic variability in the Arab-speaking world. We will focus on the early Islamic era and the end of the 19th century as crucial pivotal periods in the development of both language and linguistic terminology, as our basic assumption is that the semantic and ideological load of linguistic terms evolves in parallel with important social and political changes. The article will conclude with a preliminary exploration of recent terminological developments related to computer mediated communication (CMC).