similarity

n. similitude, likeness, resemblance

Similarity is some degree of symmetry in either analogy and resemblance between two or more concepts or objects. The notion of similarity rests either on exact or approximate repetitions of patterns in the compared items. In the case of approximate repetitions we talk about statistical similarity as found in a fractal and its parts. Finding similarities or distinguishing between dissimilarities depends on the faculties of pattern recognition and disambiguation, respectively.
See more at Wikipedia.org...

Noun
1. the quality of being similar
(antonym) dissimilarity, unsimilarity
(hypernym) sameness
(hyponym) approximation
(attribute) similar
2. a Getalt principle of organization holding that (other things being equal) parts of a stimulus field that are similar to each other tend to be perceived as belonging together as a unit
(synonym) law of similarity
(hypernym) Gestalt law of organization, Gestalt principle of organization

(n.)
The quality or state of being similar; likeness; resemblance; as, a similarity of features.
  

yi4 qiu1 zhi1 he2
Raccoons of the same hillock.
Describing persons who are of a kind. All tarred with the same brush. The final character 貉 ("he2" or "hao2") is referring to a type of raccoon dog.

an1 bu4 dang4 che1
Strolling rather than riding in a carriage.
Meaning that a leisurely stroll is just as comfortable as riding in a carriage.

wu4 yi3 lai4 ju4, ren2 yi3 qun2 fen1
Things of a kind come together, people of a mind fall into the same group.
Said of people who fall into the same group because they are similar. Like attracts like. Birds of a feather flock together.

nan4 xiong1 nan4 di4
Suffering big brother, suffering little brother.
Originally meaning brothers with the same ability and virtue. Later describing people who are in the same boat, struggling in difficulties together. Two of a kind.