'Precautionary' definitions:

Definition of 'precautionary'

adjective

Taken in advance to protect against possible danger or failure; "gave precautionary advice"; "I would take precautionary steps to keep him away" [syn: precautionary, precautional]

Definition of 'Precautionary'

From: GCIDE

Precautionary \Pre*cau"tion*a*ry\, a. Of or pertaining to precaution, or precautions; as, precautionary signals. [1913 Webster]

Synonyms of 'precautionary'

From: Moby Thesaurus

foreboding,
forehanded,
forerunning,
foreseeing,
foresighted,
forethoughted,
forethoughtful,
forewarning,
portentous,
precautional,
precautious,
precursive,
precursory,
premonitory,
prodromal,
prodromic,
provident,
provisional