This glossary has been prepared for the convenience of bilingual (English and Spanish) teachers who may not always be familiar with mathematical terminology in both languages. Often teachers must research and translate the terms necessary for each lesson. In some cases, the translations are literal, which results in the adoption of different terms for the same concept. Therefore, the glossary should accomplish two objectives: (1) uniformity of usage, encouraging all teachers in bilingual programs for Spanish speakers to use the same terminology in mathematics, and (2) convenience, saving the bilingual teacher hours of research. The glossary is divided into two sections. The first contains an alphabetical list of terms in English with the Spanish translation and the corresponding English definition. The second section contains the terms alphabetically arranged in Spanish with the English translation, and the definitions in Spanish. (JN)