Онлайн-словарь

 noun (plural -ties) 
 Etymology: Middle French identité, from Late Latin identitat-, identitas, probably from Latin identidem repeatedly, contraction of idem et idem, literally, same and same
 Date: 1570
 
 
 1. sameness of essential or generic character in different instances, sameness in all that constitutes the objective reality of a thing ;  oneness  , 
 
 2. the distinguishing character or personality of an individual ;  individuality  , the relation established by psychological identification, the condition of being the same with something described or asserted , an equation that is satisfied for all values of the symbols,  identity element  

 identity card 
  noun 
 Date: 1900
  ID card  

 identity crisis 
  noun 
 Date: 1954
 personal psychosocial conflict especially in adolescence that involves confusion about one's social role and often a sense of loss of continuity to one's personality, a state of confusion in an institution or organization regarding its nature or direction

 identity element 
  noun 
 Date: 1902
 an element (as 0 in the set of all integers under addition or 1 in the set of positive integers under multiplication) that leaves any element of the set to which it belongs unchanged when combined with it by a specified operation

 identity matrix 
  noun 
 Date: circa 1929
 a square matrix that has numeral 1's along the principal diagonal and 0's elsewhere

 identity politics 
  noun plural but singular or plural in construction
 Date: 1988
  particularism  2

 identity theft 
  noun 
 Date: 1991
 the illegal use of someone else's personal information (as a Social Security number) in order to obtain money or credit