similarity

/ˌsɪməˈlɛrəti/
noun
  1. The quality or state of being alike or having features in common.
    • The teacher pointed out the similarity in the students' answers, suggesting they had worked together.
    • There is a strong similarity between the two paintings, both using the same color palette.
    • Despite their different backgrounds, the twins share an uncanny similarity in their mannerisms.
  2. A particular feature or point that is alike between two or more things.
    • One similarity between the two books is their focus on friendship and adventure.
    • When comparing the two cars, the main similarity is their fuel efficiency.
    • The scientist noted several similarities in the DNA sequences of the two species.