dimidiation/dɪˌmɪdɪˈeɪʃən/EtymologyContinuing the Middle English dimydicion (circa 1425, in an arithmetical sense), from the Late Latin dīmidiātiō.dimidiation means The act of dividing into halves. Lexicurio rates it Sui generis — a strength score of 87 out of 100.nounThe act of dividing into halves.The condition of being divided into halves.A marshalling of two coats of arms by the bisection per pale of their escutcheons and forming a new coat of arms from the dexter half of one coat and the sinister half of the other.