necessary

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necessary

1. Logic
a. (of a statement, formula, etc.) true under all interpretations or in all possible circumstances
b. (of a proposition) determined to be true by its meaning, so that its denial would be self-contradictory
c. (of a property) essential, so that without it its subject would not be the entity it is
d. (of an inference) always yielding a true conclusion when its premises are true; valid
e. (of a condition) entailed by the truth of some statement or the obtaining of some state of affairs
2. Philosophy (in a nonlogical sense) expressing a law of nature, so that if it is in this sense necessary that all As are B, even although it is not contradictory to conceive of an A which is not B, we are licensed to infer that if something were an A it would have to be B
References in classic literature ?
von Horn," said Virginia, "but if to explain to me will necessitate betraying my father's confidence I prefer that you remain silent.
There were no words, there was no need of words; De Vac's intentions were too plain to necessitate any parley, so the two fell upon each other with grim fury; the brave officer facing the best swordsman that France had ever produced in a futile attempt to rescue his young prince.
I also have a life-saving mortar with which we might be able to throw a line over the summit of the cliffs; but this plan would necessitate one of us climbing to the top with the chances more than even that the line would cut at the summit, or the hooks at the upper end would slip.
It will necessitate travel, and later it may lead to a very much better post--possibly in the diplomatic service.
On the contrary, I have plans which necessitate my living in England.
I owed my life to her, and, all other considerations aside, that was sufficient demand upon my gratitude and my honor to necessitate my suffering every inconvenience in her service.
He says that the effort to return to his old habits and pursuits grows harder instead of easier to him every day and he implores me, if I have any interest, to exert it to get him employment that will necessitate his absence from England, and take him among new scenes and new people.
Just so with whaling, which necessitates a three-years' housekeeping upon the wide ocean, far from all grocers, costermongers, doctors, bakers, and bankers.
The allusion to the waifs and waif-poles in the last chapter but one, necessitates some account of the laws and regulations of the whale fishery, of which the waif may be deemed the grand symbol and badge.
If even the angle of a respectable Triangle in the middle class is not without its dangers; if to run against a Working Man involves a gash; if collision with an officer of the military class necessitates a serious wound; if a mere touch from the vertex of a Private Soldier brings with it danger of death; -- what can it be to run against a Woman, except absolute and immediate destruction?
The existence of the half necessitates the existence of that of which it is a half.
Three bands -- that necessitates three leaders; there is the difficulty.