The excess of cash revenues over cash outlays in a give period of time (not including non-cash expenses) WordNet 3.0

The excess of cash revenues over cash outlays in a given period of time (not including non-cash expenses) Open English WordNet

A cash flow is a real or virtual movement of money: a cash flow in its narrow sense is a payment, especially from one central bank account to another; the term 'cash flow' is mostly used to describe payments that are expected to happen in the future, are thus uncertain and therefore need to be forecast with cash flows; a cash flow CF is determined by its time t, nominal amount N, currency CCY, and account A; symbolically: CF = CF. Wikipedia

Incoming cash less outgoing cash during a given period. OmegaWiki

The sum of cash revenues and expenditures over a period of time. Wiktionary