GCA

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

• undersaying
• undersays
• under-school
• under-schools
• underscore
• underscored
• underscores
• underscoring
• underscrub
• underscrubs
• undersea
• under seal
• underseal
• undersealed
• under sealed orders
• undersealing
• undersealings
• underseals
• under-secretaries
• under-secretary
• under-secretaryship
• under-secretaryships
• underself
• undersell
• underseller