n. & v.
--n.
1. attention to safety; prudence, carefulness.
2 a esp. Brit. a warning, esp. a formal one in law. b a formal warning and reprimand.
3 colloq. an amusing or surprising person or thing.
--v.tr.
1. (often foll. by against, or to + infin.) warn or admonish.
2 esp. Brit. issue a caution to.
Phrases and idioms:
caution money Brit. a sum deposited as security for good conduct.
Etymology: ME f. OF f. L cautio -onis f. cavere caut- take heed