al Dictionaries] 
n., The capacity of a digital security service of ensuring that a transferred message has been sent and received by the
parties claiming to have sent and received the message, and of providing proof of the integrity and origin of data, both in
an unforgeable relationship, which can be verified by any third party at any time. [General Dictionaries] 
n.,
 The process of becoming obsolete or the condition of becoming nearly obsolete. [General Dictionaries]  a) No longer in use or no longer us