Definition of public-key:
(adj) :
Able to be known or seen by everyone; happening without concealment; open to general view.
(adj) :
Open to all members of a community, as opposed to only a segment of it; especially, provided by national or local authorities and supported by money from taxes.
(adj) :
(business) Of a company: having shares of stock traded publicly, for example, through a stock market.
(adj) :
Pertaining to the people as a whole, as opposed to a group of people; concerning the whole community or country.
(adj) :
Officially representing the community; carried out or funded by the government or state on behalf of the community, rather than by a private organization.
(adj) :
Pertaining to a person in the capacity in which they deal with other people on a formal or official basis, as opposed to a personal or private capacity; official, professional.