Definitions of caution
(UK) for a police officer or other official to give a spoken official warning to someone who has broken the law but who has not committed a serious crime, the caution can be classed as either formal or informal
Police cautioned more than 200 people for carrying knives in the East Midlands in a one-year period.
to warn or advise someone to be careful about something
Consumers were cautioned to always follow manufacturer's instructions when connecting or disconnecting gas containers.