Etymology
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derailment (n.)

"act of derailing or causing to leave the rails," 1850, from French déraillement, from dérailler "to go off the rails" (see derail).

updated on July 27, 2018

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Definitions of derailment from WordNet

derailment (n.)
an accident in which a train runs off its track;
From wordnet.princeton.edu, not affiliated with etymonline.