1. Business combinations.
A reduction in the total number of participants in a market, following a merger or acquisition.
This type of integration may be 'vertical' or 'horizontal'.
2. Financial maths.
In maths and financial maths, integration is the reverse process of differentiation.
3. Money laundering.
The conversion of laundered money into assets which have the appearance of having been legitimately acquired.
This is a common third stage of money laundering, following 'placement' and 'layering'.