1. One thousand billion (1,000,000,000,000 or 1012). For example EUR 100 trillion = EUR 100,000,000,000,000.
2. Historically in the UK and some other countries, "trillion" used to refer mathematically to 1,000,000,000,000,000,000 (or 1018). This historical usage never became established in finance, and is now for practical purposes defunct.