Similarity \Sim`i*lar"i*ty\, n.; pl. -ties. [Cf. F. similarit['e].]

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

Hardly is there a similarity detected between two or three facts, than men hasten to extend it to all. --Sir W. Hamilton.

Source: Webster's Revised Unabridged Dictionary (1913)