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单词 essential
释义 es·sen·tial
I. \ə̇ˈsenchəl, eˈ-, ēˈ-\ adjective
Etymology: Middle English essencial, from Late Latin essentialis, from Latin essentia essence + -alis -al
1. : of or relating to an essence: as
 a. : having or realizing in itself the essence of its kind : having or consisting of the basic, most fundamental nature, property, quality, or attribute peculiar to or necessary or indispensable to its kind
  < the problem is to grasp the essential man — Carl Bridenbaugh >
  < the sunshine where it fell was a blinding essential light without color, so that the grass looked like snowdrifts — John Buchan >
 b. : forming or constituting the essence of something : making up or being the constituent or intrinsic character of very nature of a thing
  < his eyes were wide, as one who looks at his essential self through the mask we wear — George Meredith >
  < wished his work to have no ornament other than its own essential beauty, without exterior decoration — Aldous Huxley >
  < our essential admixture of matter and spirit, emotions and intelligence — Word Study >
 c. : belonging to or being part of the essence of something : belonging to the constituent fundamental character of a thing : not accidental to something
  < stamens are essential organs of a flower >
  < has not shown that the merits of puritan thought are essential and the defects accidental — M.G.White >
  < the most essential characteristic of mind is memory — Bertrand Russell >
  < the great charm of his personality, his essential sympathy and kindliness — M.R.Cohen >
  < did much to direct attention to the essential immorality of lotteries — J.S.Kendall >
  — compare accessory 1
 d. : constituting an indispensable structure, core, or condition of a thing : basic, fundamental
  < a little excessive to have to sit through so much frankly nonessential repertory in order to hear two short works from the band's essential repertory — Virgil Thomson >
  < there was an essential soundness in his line of reasoning >
2.
 a. : necessary, indispensable
  < transporting the heavy ore by rail was difficult and expensive; a water route was essential — Allan Nevins & H.S.Commager >
  < international scientific meetings are essential to scientific progress for the reason that no one nation has a monopoly of either ideas or brains — Saturday Review >
  < agreed to request uniform standards for deferment of essential physicians — Current Biography >
  < Lutherans from the sixteenth century have regarded choir singing as essential to their ritual — American Guide Series: Minnesota >
 b. : unavoidable
  < a good many essential tasks are left until the last minute — Stewart Cockburn >
  < physicians and lawyers may count their purchases of books as essential expenses of their profession in computing income tax — Report: (Canadian) Royal Commission on National Development >
 c. : important in the highest degree : demanding maximum attention : unavoidably significant
  < a great reserve of manpower essential to the defense of the homeland >
 d. : minimal but fundamental to the achievement of an end
  < make yourself a small pocket map showing the essential landmarks around camp so that you can find your way back — Boy Scout Handbook >
3. : containing the essence of that portion of a plant or substance which is marked by its characteristic odor or virtue : being or relating to an essence (sense 8)
 < an essential odor >
— see essential oil
4. of a musical tone : necessary to or determining the tonality of a piece of music
 < did not alter the essential tones but added grace notes >
5. : having no obvious or known cause : idiopathic, inherent
 < essential disease >
Synonyms:
 fundamental, vital, and cardinal all imply maximum importance, indispensability, and necessary priority in considerations, plans, or discussions. Often the words are interchangeable. When they do differ in implication, these differences are suggested by the etymologies. essential may suggest that the matter in question involves the very essence, or being or real nature, of whatever is concerned
  < but in the epic, lyric, the dramatic … ideality in contrast with actuality plays an intrinsic and essential part — John Dewey >
  < undoubtedly correct in concluding that the essential emotion of the play [Hamlet] is the feeling of a son toward a guilty mother — T.S.Eliot >
  fundamental may suggest something of the nature of a foundation, something on which a system or structure rests
  < such fundamental methods as induction and deduction, analysis, synthesis, and comparison are common to all types of systematic knowledge — René Wellek & Austin Warren >
  < recognition of the importance of fundamental skills, since in a democracy citizens must be able to compute, read, write, listen, and speak effectively — New York Times >
  vital may suggest that which is necessary to continued life or existence of whatever is in question
  < nitrate, necessary in fertilizers, but vital to the manufacturers of explosives in case of war — A.C.Morrison >
  < barriers within our own country which stand in the way of bringing to Americans resources vital to their own safety and interest — C.E.Odegaard >
  cardinal may refer to the decisive or conclusive since it may suggest that on which an outcome hinges or pivots
  < to one cardinal principle Edwards was faithful — the conception of the majesty and sufficiency of God, and this polar idea provides the clue to both his philosophical and theological systems — V.L.Parrington >
  < the cardinal virtue in the Shavian scale … is responsibility; every creed he has attacked Shaw has attacked on the grounds of irresponsibility — E.R.Bentley >
Synonym: see in addition needful.
II. noun
(-s)
: something essential: as
 a. : something basic or fundamental especially belonging to or forming part of the minimal indispensable body, character, or structure of a thing
  < the essentials of the good life >
  < the essentials of astronomy >
  < gave only the essentials of the story >
 b. : something necessary, indispensable, or unavoidable
  < work was an essential to survival >
  < a man considered an essential in his office >
  < a job that was both a great chore and an essential to the success of the enterprise >
  < all that sort of duplicity is an essential in any handling of men by methods other than direct authority — Hilaire Belloc >
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