A software development philosophy that emphasizes incremental delivery, team collaboration, continual planning, and continual learning 

Audio reference link: https://thecyberwire.com/glossary/agile-software-development

"Velocity 09: John Allspaw and Paul Hammond, "10+ Deploys Pe" John Allspaw and Paul Hammond, 2009 Velocity Conference,

YouTube, 25 June 2009.