- (of a proposition) such that a denial of it involves a self-contradiction.
- (of an inference or argument) such that its conclusion cannot be false if its supporting premises are true.
- (of a condition) such that it must exist if a given event is to occur or a given thing is to exist.Compare sufficient(def 2).
noun, plural nec·es·sar·ies.
- necessary condition,
- necessary stool,
Origin of necessary
Examples from the Web for necessary
He could order the Justice Department to begin the necessary regulatory work.
Yet, what my peers do not realize – or cannot handle – is that rejection is a necessary part of forging a romantic relationships.Random Hook-Ups or Dry Spells: Why Millennials Flunk College Dating|Ellie Schaack|January 1, 2015|DAILY BEAST
But as is her way, Kaling defended why the episode was not only funny, but necessary.Year of the Butt: How the Booty Changed the World in 2014|Kevin Fallon|December 30, 2014|DAILY BEAST
Unfortunately, the underground tunnels that were used to transport booze and, if necessary, escaping patrons, are off-limits.
However, we have just had a necessary wake-up call that all is not as secure as we believed.A Gift to the Jihadis: The Unseen Airport Security Threat|Clive Irving|December 27, 2014|DAILY BEAST
And this is all that is necessary as a preliminary to the discussion of just profits.Distributive Justice|John A. (John Augustine) Ryan
As I have already said, we had made four oars, but our boat was so small that only two were necessary.The Coral Island|R. M. Ballantyne
And considering the pressure of the necessary preparation for schools, the temptation to shun the byways is very great.An American at Oxford|John Corbin
He denied that he was party to the attempt, and paid the necessary fee to the Hanaper for his pardon.William de Colchester|Ernest Harold Pearce
He was aware that his speech was growing far louder than necessary.Cytherea|Joseph Hergesheimer
- (of a statement, formula, etc) true under all interpretations or in all possible circumstances
- (of a proposition) determined to be true by its meaning, so that its denial would be self-contradictory
- (of a property) essential, so that without it its subject would not be the entity it is
- (of an inference) always yielding a true conclusion when its premises are true; valid
- (of a condition) entailed by the truth of some statement or the obtaining of some state of affairsCompare sufficient (def. 2)
Word Origin for necessary
late 14c. "needed, required, essential, indispensable," from Old French necessaire "necessary, urgent, compelling" (13c.), and directly from Latin necessarius "unavoidable, indispensable, necessary," from necesse "unavoidable, indispensable," originally "no backing away," from ne- "not" + cedere "to withdraw, go away, yield" (see cede). The root sense is of that from which there is no evasion, that which is inevitable. Necessary house "privy" is from c.1600. Necessary evil is from 1540s (the original reference was to "woman").
mid-14c., "needed, required, or useful things; the necessities of life; actions determined by right or law," perhaps from Old French necessaire (n.) "private parts, genitalia; lavatory," and directly from Latin necessarius (n.), in classical Latin "a relation, relative, kinsman; friend, client, patron;" see necessary (adj.).