Definition of "similar"

similar

/ˈsɪmələ/

adjective
comparative more similar, superlative most similar
1. Having traits or characteristics in common; alike, comparable.
  Quotations
  So this was my future home, I thought! Certainly it made a brave picture. I had seen similar ones fired-in on many a Heidelberg stein. Backed by towering hills, […] a sky of palest Gobelin flecked with fat, fleecy little clouds, it in truth looked a dear little city; the city of one's dreams.
  1908, W[illiam] B[lair] M[orton] Ferguson, chapter IV, in Zollenstein, New York, N.Y.: D. Appleton & Company
  Similar studies of rats have employed four different intracranial resorbable, slow sustained release systems—surgical foam, a thermal gel depot, a microcapsule or biodegradable polymer beads.
  2013 May-June, Charles T. Ambrose, “Alzheimer’s Disease”, in American Scientist, volume 101, number 3, page 200
2. (mathematics) Having the same shape, in particular, having corresponding angles equal and corresponding line segments proportional.
3. (mathematics, linear algebra) Of two square matrices; being such that a conjugation sends one matrix to the other.
noun
plural similars
1. That which is similar to, or resembles, something else, as in quality, form, etc.
2. (homeopathy) A material that produces an effect that resembles the symptoms of a particular disease.