necessary cause

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nec·es·sar·y cause

an etiologic factor without which a result in question will not occur; the occurrence of the result is proof that the factor is operating.
Farlex Partner Medical Dictionary © Farlex 2012
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(5) In this probabilistic form, RPV tends to identify potentially sufficient but not necessary causes. For instance, observing a connection between a breakdown in basic government services and an increased tendency toward insurgency in Baghdad, we can claim the breakdown was sufficient but not necessary for insurgent activity.
* The individual nature of this necessary cause implies the possible existence of other necessary causes whose causation is at least potential.
It is important to note that, for diseases such as cancer, alcohol is constituted as a necessary cause of disease at the population level rather than in individual cases.
Economics, although a much-ignored necessary cause, may not be sufficient.
Human papillomavirus is a necessary cause of invasive cervical cancer worldwide.
Judged against the courage that Dr Afridi has shown in a noble and necessary cause, it is an affront to diplomacy.
Again, causal claims do not describe how some F will necessary cause some G; they only say that the former disposes towards the latter.
Those imposed on Iraq in the 1990s, for instance, appear to have been a necessary cause of more deaths than were inflicted by the bombs dropped on Hiroshima and Nagasaki combined.
I maintain that he would not, since he is the ultimate and necessary cause of Y ending up on his property--consequently, Y cannot be considered a trespasser, and X can be considered responsible for whatever happens to Y as a direct and immediate result of forcing him out of X' premises.
Infection with the human papillomavirus (HPV) is the main risk factor and a necessary cause of cervical cancer.
Common to all the programs are (a) the expansion of government on a pretext of helping some unfortunate group or necessary cause, (b) the jockeying for position of lobbyists representing special interests seeking the best seat at the trough, and (c) the appropriations of huge sums of money, often in the tens or hundreds of billions of dollars, that end up in the coffers of those with the best lobbyists.

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