I recently came across a very comprehensive glossary on treasury, risk and corporate finance, published on the Association of Corporate Treasurers (ACT) website. ACT is based in the City of London, and is a professional body defining standards, promoting best practice, and supporting continuing professional development.

The glossary in monolingual (English only), but covers a wide range of terms, and is well cross-referenced. You can find it here: http://www.treasurers.org/glossary

If you work in the financial field, you might also be interested in this post about a forthcoming workshop in London, and this post about credit default swaps.