Teach Yourself: 101 Key Ideas: Buddhism

From Abhidharma to Zen...
Key Ideas are set out on each page, with cross references.

From the original publicity material:

Each book in the '101 key ideas' series contains short accounts of 101 key ideas arranged in alphabetical order. Each account gives an interesting and informative summary of the term, which will be useful whether you are at college or university, or reading for general interest. You need not read the books cover to cover; just dip in when you come across a term you don't know.
With its blending of wisdom and compassion, Buddhism is a religion and a philosophy that has transformed the lives of millions of individuals over the last two and a half thousand years.
Whether your interest is in learning something about meditation, examining Buddhism's radical look at how we can find happiness in a world where everything is changing, exploring its teachings about the interconnectedness of all life or considering its ethic of compassion towards all living things, you will find these short articles on key terms an accessible introduction to this great wisdom tradition.

Published by Hodder& Stoughton in 2000 (ISBN 0 340 78028 2), this title is now out of print - but used copies may be available through Amazon, and a free pdf of the original text is available from Papermill Books.