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Adjective: precautionary  pri'ko-shu`ne-ree [N. Amer], pri'ko-shu-n(u-)ree [Brit]
  1. Taken in advance to protect against possible danger or failure
    "gave precautionary advice"; "I would take precautionary steps to keep him away"
    - precautional

See also: precaution, preventative, preventive