Appropriate vs. Necessary

Appropriate and Necessary Definitions
Appropriate
Suitable for a particular person, condition, occasion, or place; fitting.
Necessary
Needed or required
A contract complete with the necessary signatures.
Conditions necessary to life.
Appropriate
To set apart for a specific use
Appropriating funds for education.
Necessary
Unavoidably determined by prior conditions or circumstances; inevitable
The necessary results of overindulgence.
Appropriate
To take possession of or make use of exclusively for oneself, often without permission
My coworker appropriated my unread newspaper.
Necessary
Logically inevitable
A necessary conclusion.
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Appropriate
Suitable or fit; proper.
The headmaster wondered what an appropriate measure would be to make the pupil behave better.
Necessary
Required by obligation, compulsion, or convention
Made the necessary apologies.
Appropriate
Suitable to the social situation or to social respect or social discreetness; socially correct; socially discreet; well-mannered; proper.
I don't think it was appropriate for the cashier to tell me out loud in front of all those people at the check-out that my hair-piece looked like it was falling out of place.
While it is not considered appropriate for a professor to date his student, there is no such concern once the semester has ended.
Necessary
Something indispensable.
Appropriate
(obsolete) Set apart for a particular use or person; reserved.
Necessary
Required, essential, whether logically inescapable or needed in order to achieve a desired result or avoid some penalty.
Although I wished to think that all was false, it was yet necessary that I, who thus thought, must in some sense exist.
It is absolutely necessary that you call and confirm your appointment.
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Appropriate
(transitive) To take to oneself; to claim or use, especially as by an exclusive right.
Let no man appropriate the use of a common benefit.
Necessary
Unavoidable, inevitable.
If it is absolutely necessary to use public computers, you should plan ahead and forward your e-mail to a temporary, disposable account.
Appropriate
(transitive) To set apart for, or assign to, a particular person or use, especially in exclusion of all others; with to or for.
A spot of ground is appropriated for a garden.
To appropriate money for the increase of the navy
Necessary
(obsolete) Determined, involuntary: acting from compulsion rather than free will.
Appropriate
To annex (for example a benefice, to a spiritual corporation, as its property).
Necessary
A place to do the "necessary" business of urination and defecation: an outhouse or lavatory.
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Appropriate
To make suitable to; to suit.
Necessary
(obsolete) Necessity.
Appropriate
Set apart for a particular use or person. Hence: Belonging peculiarly; peculiar; suitable; fit; proper.
In its strict and appropriate meaning.
Appropriate acts of divine worship.
It is not at all times easy to find words appropriate to express our ideas.
Necessary
Such as must be; impossible to be otherwise; not to be avoided; inevitable.
Death, a necessary end,Will come when it will come.
Appropriate
To take to one's self in exclusion of others; to claim or use as by an exclusive right; as, let no man appropriate the use of a common benefit.
Necessary
Impossible to be otherwise, or to be dispensed with, without preventing the attainment of a desired result; indispensable; requisite; essential.
A certain kind of temper is necessary to the pleasure and quiet of our minds.
Appropriate
To set apart for, or assign to, a particular person or use, in exclusion of all others; - with to or for; as, a spot of ground is appropriated for a garden; to appropriate money for the increase of the navy.
Necessary
Acting from necessity or compulsion; involuntary; - opposed to free; as, whether man is a necessary or a free agent is a question much discussed.
Appropriate
To make suitable; to suit.
Necessary
A thing that is necessary or indispensable to some purpose; something that one can not do without; a requisite; an essential; - used chiefly in the plural; as, the necessaries of life.
Appropriate
To annex, as a benefice, to a spiritual corporation, as its property.
Necessary
A privy; a water-closet.
Appropriate
A property; attribute.
Necessary
Such things, in respect to infants, lunatics, and married women, as are requisite for support suitable to station.
Appropriate
Give or assign a share of money or time to a particular person or cause;
I will earmark this money for your research
Necessary
Anything indispensable;
Food and shelter are necessities of life
The essentials of the good life
Allow farmers to buy their requirements under favorable conditions
A place where the requisites of water fuel and fodder can be obtained
Appropriate
Take possession of by force, as after an invasion;
The invaders seized the land and property of the inhabitants
The army seized the town
The militia captured the castle
Necessary
Absolutely essential
Appropriate
Suitable for a particular person or place or condition etc;
A book not appropriate for children
A funeral conducted the appropriate solemnity
It seems that an apology is appropriate
Necessary
Unavoidably determined by prior circumstances;
The necessary consequences of one's actions
Appropriate
Appropriate for achieving a particular end; implies a lack of concern for fairness
Appropriate
Meant or adapted for an occasion or use;
A tractor suitable (or fit) for heavy duty
Not an appropriate (or fit) time for flippancy
Appropriate
Suitable and fitting;
The tailored clothes were harmonious with her military bearing
Appropriate
Being of striking appropriateness and pertinence;
The successful copywriter is a master of apposite and evocative verbal images
An apt reply