compound
adjective
composed of two or more parts, elements, or ingredients.
Used to describe an action that was ongoing continuously in the past up until another past event interrupted it.
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
The aggregate of these sums had been compounding interest throughout the years.
From A Girl of the Limberlost by Gene Stratton-Porter