 “Analytic” sentences, such as “Pediatricians are doctors,” have historically been characterized as ones that are true by virtue of the meanings of their words alone and/or can be known to be so solely by knowing those meanings. They are contrasted with more usual “synthetic” sentences, such as “Pediatricians are rich,” (knowledge of) whose truth depends also upon (knowledge of) the worldly fortunes of pediatricians. Beginning with Frege, many philosophers hoped to show that the truths of logic and mathematics and other apparently a priori domains, such as much of philosophy and the foundations of science, could be shown to be analytic by careful “conceptual analysis” of the meanings of crucial words. Analyses of philosophically important terms and concepts, such as “material object,” “cause,” “freedom,” or “knowledge” turned out, however, to be far more problematic than philosophers had anticipated, and some, particularly Quine and his followers, began to doubt the reality of the distinction. This in turn led him and others to doubt the factual determinacy of claims of meaning and translation in general, as well as, ultimately, the reality and determinacy of mental states. There have been a number of interesting reactions to this scepticism, in philosophy and linguistics (this latter to be treated in the supplement, Analyticity and Chomskyan Linguistics); but, while the reality of mental states might be saved, it has yet to be shown that appeals to the analytic will ever be able to ground “analysis” and the a priori in quite the way that philosophers had hoped. (Note that all footnotes are substantive, but inessential to an initial reading, and are accessed in a separate file by clicking on the bracketed superscript. The mention vs. use of a term will be indicated either by quotation marks or italics, depending upon which is most easily readable in the context.)