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|Blessed John Duns Scotus|
Haecceity (pron.: //; from the Latin haecceitas, which translates as "thisness") is a term from medieval philosophy first coined by Duns Scotus which denotes the discrete qualities, properties or characteristics of a thing which make it a particular thing. Haecceity is a person or object's "thisness".
Charles Sanders Peirce later used the term as a non-descriptive reference to an individual.
Haecceity and quiddity 
Haecceity may be defined in some dictionaries as simply the "essence" of a thing, or as a simple synonym for quiddity or hypokeimenon. However, such a definition deprives the term of its subtle distinctiveness and utility. Whereas haecceity refers to aspects of a thing which make it a particular thing, quiddity refers to the universal qualities of a thing, its "whatness", or the aspects of a thing which it may share with other things and by which it may form part of a genus of things. Duns Scotus makes the following distinction:
Because there is among beings something indivisible into subjective parts -- that is, such that it is formally incompatible for it to be divided into several parts each of which is it -- the question is not what it is by which such a division is formally incompatible with it (because it is formally incompatible by incompatibility), but rather what it is by which, as by a proximate and intrinsic foundation, this incompatibility is in it. Therefore, the sense of the questions on this topic [viz. of individuation] is: What is it in [e.g.] this stone, by which as by a proximate foundation it is absolutely incompatible with the stone for it to be divided into several parts each of which is this stone, the kind of division that is proper to a universal whole as divided into its subjective parts?—Scotus, Ordinatio II, d. 3, p. 1. q. 2, n. 48 [Scotus, (1950-), 7:412-413; Spade (1994), 69]
Haecceity and sociology 
Social Construction of Reality, Ethnomethodology, and Conversation Analysis are the main streams that elaborated during the '60s a new kind of sociology which influenced later sociology, philosophy and political analysis. Harold Garfinkel is the founder of Ethnomethodology, and teacher of Harvey Sacks, one of the founders of Conversation Analysis. He used the word in his seminal Studies in Ethnomethodology (1963), to enhance the indexical inevitable character of any expression, situation, behavior or situation. According to him, the members display the social order they refer to within the settings of the situation they contribute to define. The study of particular situations in their "haecceity," aimed at disclosing the social order that is constructed by the members and their practices, is the object of ethnomethodology.
Haecceities is one of the many words that Garfinkel has adopted over the years to indicate the importance of the infinite contingencies in both situations and practices.—Ann Rawls, The Blackwell Companion to major contemporary social theorists, 2003, ed. Georges Ritzer.
Garfinkel's 1988 famous paper generally referred to as "Parson's Plenum" is entitled :
Evidence for Locally Produced, Naturally Accountable Phenomena of Order, Logic, Meaning, Method, etc., in and as of the Essentially Unavoidable and Irremediable Haecceity of Immortal Ordinary Society.—Sociological Theory '88, (6)1: 103-109, Spring 1988
Haecceity and philosophy 
Harold Garfinkel was drawing on phenomenology and Edmund Husserl, logic and Bertrand Russell, and perception theory and Nelson Goodman. Phenomenology is the field of studying the phenomena as such, and can thus be seen as a contemporary philosophical version of the medieval concept of haecceity, though it does not focus on the quiddity of phenomenon or their essence, but rather on the practices and perceptions that construct the phenomena.
- Gilles Deleuze and Félix Guattari. 1980. A Thousand Plateaus. Trans. Brian Massumi. London and New York: Continuum, 2004. Vol. 2 of Capitalism and Schizophrenia. 2 vols. 1972-1980. Trans. of Mille Plateaux. Paris: Les Editions de Minuit. ISBN .
- Gilles Deleuze and Félix Guattari. 1991/1994. "What is Philosophy?". Trans. Hugh Tomlinson and Gregory Burchell. New York: Columbia University Press, 1994.
See also 
- Principle of individuation
- Rigid designation
- Cf. Sanskrit tathata, "thus-ness"