precautionary

From precaution +‎ -ary.

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precautionary (comparative more precautionary, superlative most precautionary)

1. Of, pertaining to, or serving as a precaution.

   The port cities were quarantined as a precautionary measure, though no cases of the disease had been found.

precautionary (plural precautionaries)

1. (obsolete) A precaution.
   • 1748, [Samuel Richardson], Clarissa. Or, The History of a Young Lady: […], volume (please specify |volume=I to VII), London: […] S[amuel] Richardson;  […], →OCLC:

     Thou seest, Belford, by the above precautionaries, that I forget nothing.