friendship = noun

1 [countable] a relationship between friends
a close/lasting/lifelong friendship
friendships formed while she was in college
friendship with someone
He seemed to have already struck up (= begun) a friendship with Maja.
friendship between A and B
It's the story of an extraordinary friendship between a boy and a seal.
2 [uncountable] the feeling or relationship that friends have; the state of being friends
Your friendship is very important to me.
a conference to promote international friendship