Features:* Free with NO advertising* Almost 1,000 entries about Middle School Math, Algebra I, Algebra II, Geometry, Precalculus, Calculus and Statistics* Colorful, annotated illustrations* Complete sentence-based definitions in English and Spanish* Toggle display of English and Spanish terms* Alphabetical indexes* Search function in English and Spanish* Toggle display of Spanish definition -- enabling "Flash card" function* No internet connection required for use