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Oxford dictionary definition of the word Christadelphian:
a member of a Christian millenarian sect founded in the US about 1848, holding that only the just will enter eternal life, that the wicked will be annihilated, and that the ignorant, the unconverted, and infants will not be raised from the dead
of or relating to this body or its beliefs and practices
C19: from Late Greek khristadelphos, from khristoschrist + adelphos brother