Specific definitions

In computer science

• string metric
  String metric
  In mathematics, string metrics are a class of metric that measure similarity or dissimilarity between two text strings for approximate string matching or comparison and in fuzzy string searching. For example the strings "Sam" and "Samuel" can be considered to be similar...
  
  , aka string similarity
• semantic similarity
  Semantic similarity
  Semantic similarity or semantic relatedness is a concept whereby a set of documents or terms within term lists are assigned a metric based on the likeness of their meaning / semantic content....
  
   in computational linguistics

In other fields

• In engineering, Similitude (model)
  Similitude (model)
  Similitude is a concept applicable to the testing of engineering models. A model is said to have similitude with the real application if the two share geometric similarity, kinematic similarity and dynamic similarity...
  
   describe the geometric, kinematic and dynamic 'likeness' of two (or more) systems.
• In psychology, similarity (psychology)
  Similarity (psychology)
  -Cognitive psychological approaches to similarity:Similarity refers to the psychological nearness or proximity of two mental representations. Research in cognitive psychology has taken a number of approaches to the concept of similarity...
  
  
• In music, musical similarity
  Musical similarity
  Musical similarity is a certain similarity between two or more musical fragments. If these fragments are from one musical piece a musical similarity implies a repetition of the first occurring fragment. As well, eventually, the similarity does not occur by direct repetition, but by presenting in...
  
  
• In chemistry, chemical similarity
  Chemical similarity
  Chemical similarity refers to the similarity of chemical elements, molecules or chemical compounds with respect to either structural or functional qualities, i.e. the effect that the chemical compound has on reaction partners in anorganic or biological settings...
  
  

See also

• Same (disambiguation)
• Difference (disambiguation)
• Equality (mathematics)
• Identity (philosophy)
  Identity (philosophy)
  In philosophy, identity, from , is the relation each thing bears just to itself. According to Leibniz's law two things sharing every attribute are not only similar, but are the same thing. The concept of sameness has given rise to the general concept of identity, as in personal identity and...