1. Taken in advance to protect against possible danger or failure
   - precautionary

See also: preventative, preventive

• quassia
• Quassia amara
• quassia family
• quat
• quatercentenary
• quatercentennial
• quatern
• quaternary
• quaternary ammonium compound
• Quaternary period
• quaternate
• quaternion
• quaternity
• quatorze
• quatrain
• quatrefoil
• quattrocento
• quaver
• quavering
• quaveringly
• quavery
• quay
• quayage
• quayside
• qubit