1. Logically valid
   - reasoned, sound

See also: valid

• coryphantha
• corythosaur
• corythosaurus
• coryza
• cos
• cos lettuce
• Cosa Nostra
• coscoroba
• cosec
• cosecant
• coseismal
• coseismic
• coset
• cosh
• cosher
• cosign
• cosignatory
• cosigner
• cosily
• Cosimo de Medici
• Cosimo the Elder
• cosine
• cosiness
• cosmea
• cosmetic