to be sure, particular, or protected; provide assurance of; guarantee: as, to guarantee protection to virtually any one.
especially To guarantee or secure indemnity for future loss or harm (as to a building from fire, or even an individual from accident or death) on specific stipulated conditions; make an interest of insurance; guarantee: as, to insure a ship or its cargo, or both, from the perils associated with sea; to insure a house against fire.
To pledge; betroth.
Synonyms Insure, Assure. Assure may express the making sure in mind: as, I was guaranteed of safety by their friendly way; insure has not yet this sense. Insure is a possible word to express the making sure actually, and it is more widespread than ensure: because, his insufficient money insured his very early return; guarantee has not yet this good sense. Insure and guarantee tend to be both utilized of this work of pledging a payment of income upon loss or demise, but assure is hardly ever used in that feeling in the United States.
to attempt to secure or ensure against loss or damage on receipt of a particular payment or premium; make insurance coverage: as, the business insures at a reduced advanced.