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The Collaborative International Dictionary
Derailment

Derailment \De*rail"ment\, n. The act of going off, or the state of being off, the rails of a railroad.

Douglas Harper's Etymology Dictionary
derailment

1850, from French déraillement, from dérailler "to go off the rails" (see derail).

Wiktionary
derailment

n. 1 (context rail transport English) The action of a locomotive or train leaving the rails along which it runs 2 (context psychiatry English) A pattern of discourse (in speech or writing) that is a sequence of unrelated or only remotely related ideas.

WordNet
derailment

n. an accident in which a train runs off its track

Wikipedia
Derailment

A derailment is said to take place when a vehicle such as a train runs off its rails. This does not necessarily mean that it leaves its track. Although many derailments are minor, all result in temporary disruption of the proper operation of the railway system, and they are potentially seriously hazardous to human health and safety. Usually, the derailment of a train can be caused by a collision with another object, an operational error, the mechanical failure of tracks, such as broken rails, or the mechanical failure of the wheels.

Derailment (thought disorder)

__NOTOC__ In psychiatry, derailment (also loosening of association, asyndesis, asyndetic thinking, knight's move thinking, or entgleisen) is a thought disorder characterized by discourse consisting of a sequence of unrelated or only remotely related ideas. The frame of reference often changes from one sentence to the next.

In a mild manifestation, this thought disorder is characterized by slippage of ideas further and further from the point of a discussion. Derailment can often be manifestly caused by intense emotions such as euphoria or hysteria. Some of the synonyms given above (loosening of association, asyndetic thinking) are used by some authors to refer just to a loss of goal: discourse that sets off on a particular idea, wanders off and never returns to it. A related term is tangentiality—it refers to off-the-point, oblique or irrelevant answers given to questions. In some studies on creativity, knight's move thinking, while it describes a similarly loose association of ideas, it is not considered a mental disorder or the hallmark of one; it is sometimes used as a synonym for lateral thinking.

Usage examples of "derailment".

Smith called up incoming reports on the derailment he had just survived, downloading them into his ongoing Amtrak file.

The earliest reports simply attributed the derailment to excessive speed.

The TV was on, showing coverage of the derailment less than a mile away.

But the others landed in soft soil gouged by the derailment and they made it okay.

No one knew when it would end, because as long as man set hurtling engines on ribbons of steel rail, derailments were inevitable.

I got more of these fandangled derailments these last two, three years than I care to count.

The train crashes and derailments over the past three years were almost evenly divided between the Amtrak passenger system and the various long-haul and short-line freight railroads.

Recall that these derailments have been commonplace for three years now.

America new crashes, derailments and rail accidents were being reported, Smith input these new destinations into his exploding data base.

On the left were the spirits of generations past who had showed up too early to enjoy the benefits of nanotechnology and (not explicitly shown, but somewhat ghoulishly implied) croaked from obsolete causes such as cancer, scurvy, boiler explosions, derailments, drive-by shootings, pogroms, blitzkriegs, mine shaft collapses, ethnic cleansing, meltdowns, running with scissors, eating Drano, heating a cold house with charcoal briquets, and being gored by oxen.

Snowdrifts blocking roads have isolated villages in many remote areas, and British Rail is fighting numerous electrical failures and minor derailments caused by the snow.

Grand Central’s already patched, in fact: the derailments never happened, the tracks are clean.

Panesa had interviewed women who lovingly seasoned home cooking with arsenic, and he had covered car wrecks, plane crashes, train derailments, skydiving gone bad, scuba diving gone worse, bungee jumping by drunks who forgot the cord, and fires, and drownings.

Along the way Tom encounters mechanical failures, derailments, and eccentric characters like Agnes Joe, who rides trains all the time, though no one knows why.

The Environmental Protection Agency, among many other government agencies, had rushed investigators to the nightmarish scene with orders to search for the cause of the train's derailment.