contingent remainder

from Bouvier's Law Dictionary, Revised 6th Ed (1856)
CONTINGENT REMAINDER, estates. An estate in remainder which is limited to 
take effect, either to a dubious and uncertain person, or upon a dubious and 
uncertain event, by, which no present or particular interest passes to the 
remainder-man, so that the particular estate may chance to be determined and 
the remainder never take effect. 2, Bouv. Inst. n. 1832. Vide Remainder. 
    

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