A relation.
Reciprocal exchange of civilities, especially conversation between persons by means of letters.
Postal or other written communications.
An agreement of situations or objects with an expected outcome.
Newspaper or news stories.
A similarity between physical and spiritual things (e.g. light to wisdom, or warmth to love)
A state of mutual understanding among parties
An event consisting of level setting
The set of values x for which a real-valued function f(x) is equal to a given constant.
To establish a baseline of mutual understanding