[2] 実体とは、人や組織やものです。

[1] Final: OpenID Connect Core 1.0 incorporating errata set 1 (2014-11-09 04:00:29 +09:00 版) <http://openid.net/specs/openid-connect-core-1_0.html#Terminology>

Something that has a separate and distinct existence and that can be identified in a context. An End-User is one example of an Entity.