(in company names) Reinsurance.

A municipality of Vestfold, Norway

Regarding, re.

Initialism of Royal Engineers, a regiment in the British Army.

(computing theory) Abbreviation of "recursively enumerable"; the class of decision problems for which a 'yes' answer can be verified by a Turing machine in a finite amount of time.

(chiefly law) In the matter of; with regard to.

(informal) contracted form of are (inflection of the verb "to be")

(law) Something that has no owner and is not subject to the jurisdiction of any state, but is susceptible to national appropriation.

(law) A legal claim that has already been decided in another lawsuit or proceeding, and therefore must be dismissed.

(Britain, colloquial) A desirable residence.