An instance of a relationship between two or more entities, in which an entity assumes that another entity will act as authorised/expected. The risk/trust relationship depends on who you are and what you want to do at any instance. The degrees of separation between parties can decrease the trust (increase the risk). They trust you, so I (kinda) trust you (for now) to do (only) this.

Source: http://identityaccessman.blogspot.com/2006/08/identity-dictionary.html