cusec /ˈkjuː.sɛk/ noun1 •A measure of the rate of flow of fluid, especially through a pipeline, equal to one cubic foot per second.If the flow is between 70,000 cusecs - 75,000 cusecs (expected during the first ten days of March and the second ten days of May), Bangladesh receives 35,000 cusecs, and India the rest. — 2004 formscusecs