Definition: Exponential growth
OECD - Data and Metadata Reporting
Exponential growth refers to the situation where growth compounds continuously at every instant of time.
Because compounding takes place at intervals much longer than an instant, geometric growth is regarded as being a "special case" of exponential growth.
Organisation for Economic Co-operation and Development (OECD), "Data and Metadata Reporting and Presentation Handbook", OECD, Paris, 2007