The following definitions are quoted directly from the Defense Acquisition University Glossary (13th ed., 2009). If you encounter acquisition-related terminology or acronyms that you don't understand, this is a great resource!
The conceptualization, initiation, design, development, test, contracting, production, deployment, logistics support (LS), modification, and disposal of weapons and other systems, supplies, or services (including construction) to satisfy DOD needs, intended for use in, or in support of, military missions.
A directed, funded effort that provides a new, improved, or continuing materiel, weapon, or information system or service capability in response to an approved need. Acquisition programs are divided into categories that are established to facilitate decentralized decision making, execution, and compliance with statutory requirements. (DODD 5000.01)
You may also be interested in: