1 [intransitive and transitive] formal
to mix together, or to make different things do this:
Many towns allow recyclable items to be commingled for collection in a single container.
2 [transitive] American English technical
if a financial organization commingles money, it mixes its own money with money that belongs to its customers or to another part of the business, usually in an illegal way
commingle something with something
The company faces charges that it commingled its own funds with customer funds.
—commingling noun [uncountable]