1. [Brit] Advisory, Conciliation and Arbitration Service 
2. Airborne Collision Avoidance System

Encyclopedia: ACAS

• sum-up
• sumac
• sumac family
• sumach
• Sumatra
• Sumatran
• Sumer
• Sumerian
• Sumerology
• summa
• summa cum laude
• summarily
• summarisation
• summarise
• summarization
• summarize
• summary
• summary judgement
• summary judgment
• summary treatment
• summat
• summate
• summation
• summational
• summative