1. Official classification for documents; meant to be seen by only the person to whom it is directed

See also: classified

• cluster bomb
• cluster bomblet
• cluster headache
• cluster of differentiation 4
• cluster of differentiation 8
• clustered
• clustered bellflower
• clustered lady's slipper
• clustered poppy mallow
• clustering
• clutch
• clutch bag
• clutch pedal
• clutches
• clutter
• clutter up
• cluttered
• clv
• clx
• clxv
• clxx
• clxxv
• clxxx
• Clyde
• Clyde Tombaugh