Friendliness is a related term of fraternisation.
As nouns the difference between friendliness and fraternisation
is that friendliness is the quality of being friendly while fraternisation is (chiefly|british).
friendliness
English
Noun
(-)
The quality of being friendly.
Synonyms
* affability
* bonhomie
* geniality
* pleasantness
Antonyms
* hostility
Coordinate terms
* See also
* kindness
* good-heartedness
* good-naturedness