!!! Overview
[{$pagename}] is a [Cryptographic Key] is called ephemeral if it is generated for each execution of a key establishment process. 

[{$pagename}] may be used more than once, within a single session (e.g., in broadcast applications) where the sender generates only one [{$pagename}] pair per message and the [Private Key] is combined separately with each recipient's [Public Key]. Contrast with a static key.

Private ephemeral key agreement key: Private ephemeral key agreement keys are the private keys of asymmetric key pairs that are used only once to establish one or more keys (e.g., key wrapping keys, data encryption keys, or [MAC] keys) and, optionally, other keying material (e.g., [Initialization Vectors]).

!! Public [{$pagename}] agreement key
Public [{$pagename}] agreement keys are the [Public Keys] of [asymmetric Key] pairs that are used in a single [Key-Exchange] transaction to establish one or more keys (e.g., key wrapping keys, data encryption keys, or MAC keys) and, optionally, other keying material (e.g., [Initialization Vectors]).

!! More Information
There might be more information for this subject on one of the following:
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* [#1] - [Ephemeral_key|Wikipedia:Ephemeral_key|target='_blank'] - based on information obtained 2017-03-02