noun
General term for a cooperative relationship, often in business or collaborative contexts.
両社は新しいプロジェクトでパートナーシップを結んだ。
The two companies formed a partnership for the new project.
noun
same-sex partnership
Specifically refers to a legally or socially recognized relationship between two people of the same sex, similar to marriage.
この自治体では、同性カップルにパートナーシップ証明書を発行している。
This municipality issues partnership certificates to same-sex couples.