From absolute value to Zeno's paradox, Sidebotham (mathematics, St. Bede's College, New Zealand) offers entries of three types: processes that explain specific skills (such as algebra), definitions of words with applications (such as proportion), and enrichment material, for entertainment (such as hexomino. The alphabetical arrangement of entries is intended to make the book a useful reference for general readers, but a well-indexed thematically arranged text might have succeeded better as an antidote to "math anxiety," which the author states as his goal.