1. One of the four "liberal arts" making up the quadrivium

1. Having four ways meeting in a point

Derived forms: quadrivials

Encyclopedia: Quadrivial

• Defense Advanced Research Projects Agency
• defense attorney
• defense contractor
• Defense Department
• defense force
• Defense Information Systems Agency
• Defense Intelligence Agency
• defense laboratory
• defense lawyer
• defense lawyers
• Defense Logistics Agency
• defense mechanism
• defense policy
• defense program
• defense reaction
• Defense Reutilization and Marketing Service
• Defense Secretary
• defense system
• defense team
• Defense Technical Information Center
• defenseless
• defenselessly
• defenselessness
• defenseman
• defensibility