- 1arrange for compensation in the event of damage to or loss of (property), or injury to or the death of (someone), in exchange for regular payments to a company or to the state:the table should be insured for £2,500 the company had insured itself against a fall of the dollar [no object]:businesses can insure against exchange rate fluctuations
- 3another term for ensure.
late Middle English (in the sense 'assure someone of something'): alteration of ensure
There is considerable overlap between the meaning and use of insure and ensure. In both British and US English the primary meaning of insure is the commercial sense of providing financial compensation in the event of damage to property; ensure is not used at all in this sense. For the more general senses, ensure is the more usual word, but insure is also sometimes used, particularly in US English, e.g. bail is posted to insure that the defendant appears for trial; the system is run to ensure that a good quality of service is maintained.