This math dictionary is for grades Kg.-6.

http://www.hbschool.com/glossary/math2/index_temp.html

Dictionary with a lot of math terms

http://www.teachers.ash.org.au/jeather/maths/dictionary.html

Math Dictionary /Grades up to 8th

http://www.harcourtschool.com/glossary/math_advantage/glossary8.html

Math Terms through high school

http://www.mathwords.com/a.htm