!!! Overview
Frankly, I can not determine a difference in [Consent] [Authorization] or [Delegation]

We also see __Authorized__, __Authorise__ or __[Authorization]__ as the same other than the noun vs verb and possibly the [Context].

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There maybe some narrow legal definitions (like [HIPAA]) that delineate differences between [consent] and [authorization] and [Delegation] but in general, they are could be used interchangeably
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!! What is Consent? (According to [HIPAA])[1]
A consent as defined by the [HIPAA Privacy Rule] is a general document that gives healthcare providers, which have a direct treatment relationship with a [patient], [permission] to use and disclose all [PHI] for [TPO]. It gives [permission] __only to that provider__, not to any other person. [Health Care Providers] may condition the provision of treatment on the individual providing this [consent]. One [consent] may cover all uses and disclosures for [TPO] by that provider, indefinitely. A consent need not specify the particular information to be used or disclosed, nor the recipients of disclosed information.

Only doctors or other health care providers with a direct treatment [relationship] with a [patient] are required to obtain [consent]. Generally, a "direct treatment provider" is one that treats a patient directly, rather than based on the orders of another provider, and/or provides health care services or test results directly to [patients]. Other health care providers, health plans, and health care clearinghouses may use or disclose information for [TPO] without consent, or may choose to obtain a consent.

!! What is [Authorization] (According to [HIPAA])
An [authorization] is a more customized document that gives [covered entities|HIPAA Covered Entity] [permission] to use specified [PHI] for specified purposes, which are generally other than [TPO], or to disclose [PHI] to a [Third-party] specified by the individual. [Covered entities|HIPAA Covered Entity] may not condition treatment or coverage on the individual providing an [authorization]. An [authorization] __is more detailed and specific than a consent__. It (the [Authorization]) covers only the uses and disclosures and only the PHI stipulated in the authorization: 
* it has an [Expiration Date]
* and, in some cases, it also states the purpose for which the information may be used or disclosed.

An [authorization] is __required__ for use and disclosure of [PHI] not otherwise allowed by the rule. In general, this means an authorization is required for purposes that are not part of [TPO] and not described in § 164.510 (uses and disclosures that require an opportunity for the individual to agree or to object) or § 164.512 (uses and disclosures for which [consent], [authorization], or an opportunity to agree or to object is not required). Situations in which an authorization is required for TPO purposes are identified and discussed in the next question.

All [covered entities|HIPAA Covered Entity], not just direct treatment providers, must obtain an [authorization] to use or disclose [PHI] for these purposes. 

For [example], a [covered entity|HIPAA Covered Entity] would need an [authorization] from individuals to sell a [patient] mailing list, to disclose information to an [employer] for employment decisions, or to disclose information for eligibility for life insurance. A [covered entity|HIPAA Covered Entity] will never need to obtain both an individual’s [consent] and [authorization] for a single use or disclosure. However, a provider may have to obtain [consent] and [authorization] from the same [patient] for different uses or disclosures. For example, an obstetrician may, under the [consent] obtained from the patient, send an appointment reminder to the patient, but would need [authorization] from the patient to send her name and address to a company marketing a diaper service.

!! More Information
There might be more information for this subject on one of the following:
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* [#1] - [What is the difference between consent and authorization under the Privacy Rule?|https://clearwatercompliance.com/hipaa-hitech-news/difference-consent-authorization-privacy-rule//|target='_blank'] - based on information obtained 2016-02-28-