Release
German: Freigabe oder Veröffentlichung In software development, release refers to the implementation of a product version with new released changes. There can be several releases until the finished product.
Release Management
German: Freigabe- oder Veröffentlichungsverfahren Release management comprises the planning and control of the publication of releases.
Requirements engineering
Requirements means requirements, engineering means to develop, construct, execute. Thus, requirements engineering is about capturing, specifying, and managing requirements for a system, product, or software.
ROI - Return Of Investment
Business indicator for calculating the profitability of an investment or entrepreneurial activity. The ROI provides information on when an investment has paid off or whether it is profitable.
Rollout
German: herausholen oder ausrollen Rollout is a term that means something like introduction or market launch. Rollout always refers to the broad introduction of e.g. a new software or also generally for hardware.
DE 
EN