similarity

noun4

1. •
   Closeness of appearance to something else.
2. •
   The relation of sharing properties.

   • Hardly is there a similarity detected between two or three facts, than men hasten to extend it to all. — 1857
3. •
   A transformation (of a Euclidean space) that preserves angles and the ratios of distances
4. •
   The property of two matrices being similar.