GCA

1. Ground control (or controlled) approach system, or ground control apparatus (aeronautics)
2. Guatemala, Central America (IVR)

• opiums
• opium-smoker
• opobalsam
• opobalsams
• opodeldoc
• opodeldocs
• opopanax
• opopanaxes
• oporice
• oporices
• opossum
• opossums
• opossum shrimp
• opossum shrimps
• opotherapies
• opotherapy
• opp
• oppidan
• oppidans
• oppignerate
• oppignerated
• oppignerates
• oppignerating
• oppignorate
• oppignorated