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1. constituting the necessary or inherent part of a thing; giving a substance its peculiar and necessary qualities.
2. indispensable; required in the diet, as essential fatty acids.
3. idiopathic; self-existing; having no obvious external cause.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.


1. Necessary, indispensable, (for example, essential amino acids, essential fatty acids).
2. Characteristic of.
3. Determining.
4. Of unknown etiology.
5. Relating to an essence (for example, essential oil).
6. Synonym(s): intrinsic
Farlex Partner Medical Dictionary © Farlex 2012


1. Fundamentally important or necessary: essential ingredients.
2. Medicine Of, relating to, or being a condition or a disease whose cause is unknown: essential hypertension.
3. Biochemistry Being a substance that is required for normal functioning but cannot be synthesized by the body and therefore must be included in the diet: essential amino acids.
1. Something fundamental.
2. Something necessary or indispensable.

es·sen′ti·al′i·ty (-shē-ăl′ĭ-tē), es·sen′tial·ness n.
es·sen′tial·ly adv.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.


1. Necessary, indispensable (e.g., essential amino acids, essential fatty acids).
2. Characteristic of.
3. Determining.
4. Of unknown etiology.
5. Relating to an essence (e.g., essential oil).
6. Synonym(s): intrinsic.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012


1. Absolutely required.
2. Of unknown cause.
3. (of amino acids) necessary for normal growth but not synthesized in the body.
4. Extracted from, or related to an extract from, a plant (as in essential oil). Of the essence of.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005


1. Necessary, indispensable, (e.g., essential amino acids, essential fatty acids).
2. Characteristic of.
3. Determining.
4. Synonym(s): intrinsic.
Medical Dictionary for the Dental Professions © Farlex 2012

Patient discussion about essential

Q. Is it essential to make an exercise plan? I am trying for an exercise plan ……Is it essential to make an exercise plan?

A. by just doing any exercises any time, your body will gain some benefits. but planning it in regular schedule will absolutely help you to be healthier and more fit.
there will be a lot of benefits that you can have if you do the exercise plan (these 2 weeks to reduce some weight, then another 2 weeks to maintain it, then the rest you can start building some muscles, etc.)

good luck, and stay healthy always..

Q. How do i know what essential tools/instruments i need to buy for my baby?

A. we bought a lot of crap when out first born came along. most of it was really not useful and we could easily do without. form what i remember, we should have bought maybe second hand crib and not a new one, all this miniature outfits were really expendable. the baby grows VERY fast. all kind of shoes- until the day he start walking, it's just a waste of time.

Q. Should I go for the knife? I have essential tremor for many years, and in the last few years it seems nothing helps it, and although I tried all the drugs my doctor could offer me, nothing helps. It really ruins my life, and recently I read about a surgery that suppose to treat it, called thalamotomy- does anyone know anything about it?

A. It's a possibility, and considered effective (reducing tremor in most of the patients). However, it has quite serious side effects, that can result even in weakness of some parts of your body. You should think really good before you opt for this treatment. Good luck!

More discussions about essential
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References in periodicals archive ?
The mid-range revenue defensibility assessment reflects Denver Health's essentiality in the market and their broad operating platform in the Denver area, the stable service area with a growing employment base and economic diversity, mitigated by a challenging payor mix with significant reliance on governmental payors.
Fourth: HRH the Prime Minister instructed the essentiality to improve the type of available job slots and their statuses in order for the citizens to like them and he instructed continuous care for developing the human resources and training and promoting the culture of work.
It expects operating flexibility to remain very strong, consistent with service essentiality and a history of healthy profitability.
Fitch expects the district to maintain a stable financial profile through the cycle based on its very strong cost flexibility and essentiality of its services to the community.
The 'AA-' rating reflects the essentiality of the assets, overlapping management of UCF and UCFCC, UCF's financial support of UCFCC operations, and UCF's agreement to replenish debt service reserve draws.
Fitch believes UCF's support is reliable based on the essentiality of the assets and extensive integration of management between UCF and UCFCC.
It expects CCHD to maintain strong operating cost flexibility based on its tax revenue support, essentiality and historically strong cost management.
Fitch believes that MHG's leading market position with limited competition and the essentiality of MHG as a safety net provider offset the high dependence on government payors and weak demographics in the area.
The 'A' rating reflects WCAA's continued favorable operating and financial trends anchored by its central geographic location, demonstrated essentiality to Delta Air Lines' (Issuer Default Rating BBB-/Stable) global operations, and a fully residual long-term use and lease agreement extending through 2032.