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 ?
She always felt wicked after it, for the pretty things were seldom necessaries, but then they cost so little, it wasn't worth worrying about, so the trifles increased unconsciously, and in the shopping excursions she was no longer a passive looker-on.
the whey and the grapes being necessaries of life to certain invalids whom physicians cannot repair, and who only continue to exist by the grace of whey or grapes.
Upon the right and left, I was walled in by granite warehouses of the widest dimensions, stowed to their utmost capacity with the necessaries and comforts of life.