Waterfall Software Development Method (noun) [Word Notes]

A software development model that relies on a series of sequential steps that flow into each other, like a series of waterfalls. 
CyberWire Glossary link: https://thecyberwire.com/glossary/waterfall-software-development
Audio reference link: “Creating Video Games - Agile Software Development,” by Sara Verrilli, MIT OpenCourseWare, YouTube, 10 December 2015