similar + -ity

source: By DEMcAdams - Own work, CC BY-SA 4.0

noun (plural similarities)

the state or fact of being similar:

«…間の/…との/…における/…の» ; U類似, 相似; C類似点, 相似点 «between/to, with/in/of» (↔ difference)

e.g. the similarity of symptoms makes them hard to diagnose.

(usually similarities) a similar feature or aspect:

e.g. the similarities between people of different nationalities.