||This article may be confusing or unclear to readers. (December 2009)|
 In narratology
Algirdas Julien Greimas (1917-1992), professor of semiotics, is widely credited with producing the actantial model in 1966. This model reveals the structural roles typically performed in story telling; such as "hero, villain (opponent of hero), object (of quest), helper (of hero) and sender (who initiates the quest)." Each of these roles fulfill an integral component of the story, or, narrative. Without the contribution of each actant, the story may be incomplete. Thus, an "actant" is not simply a character in a story, but an integral structural element upon which the narrative revolves.
An actant can also be described as a binary opposition pairing, such as a hero paired with a villain, a dragon paired with a dragon slaying sword, a helper paired with an opponent. Actantal relationships are therefore incredibly useful in generating problems within a narrative that have to be overcome, providing contrast, or in defining an antagonistic force within the narrative. However, the same character can simultaneously have a different actant (or way of concern) in regard to a different sequence of action, event or episode in the story. Therefore, it should be distinguished from a character's consistent role in the story like the archetype of a character. The concept of actant is important in structuralism of narratology to regard each situation as the minimum independent unit of story.
|“||[Linguistically], Actants have a kind of phonemic rather than a phonetic role: they operate on the level of function, rather than content. That is, an actant may embody itself in a particular character (termed an acteur) or it may reside in the function of more than one character in respect of their common role in the story's underlying 'oppositional' structure. In short, the deep structure of the narrative generates and defines its actants at a level beyond that of the story's surface content.||”|
— Terence Hawkes, Structuralism and Semiotics (Berkeley: University of California Press, 1977), p. 89
 As defined by Julia Kristeva
|This section does not cite any references or sources. (June 2011)|
In 1969 Julia Kristeva also attempted to understand the dynamic development of the situations in `narratives with Greimas' Actant-Model. She thought the subject and the object can change the positions mutually and the Supporter and the Opposition also change the positions accordingly. Furthermore, the pair of the Subject and the Object sometimes change the position with the pair of the Supporter and the Oppositionist. There are, however, plural overlapping situations in narrative at the same time. To contend with the overlapping situations present in all narrative structure, she called the potential actant shift not "change" but "transformation."
 As defined by Vladimir Propp
Independently, researching Russian folklores, Vladimir Propp also provided the "7 act spheres":
- Princess and the father
- Bogus hero
However, these are not the types of the person in the story, but rather patterns of behavior; therefore the same person acts sometimes as one "sphere", and later as a different "sphere".
 In linguistics
- "prime actant", the nominative case
- "second actant", the accusative case
- "third actant", the dative case
This concept of actant is similar to that of argument.
Algirdas Julien Greimas redefined actants as the 3 pairs "Modulations":
- The Actant-Subject and the Actant-Object of Action.
- The Actant-Sender and the Actant-Receiver of Information
- The Actant-Supporter and the Actant-Oppositionist of Volition.
 In sociology
 In astrology
Since ancient times, astrology considered and analyzed the position of the persons concerning a situation with the symbols of the celestial objects and constellations. Georges Polti counted up the needed positions in his famous The Thirty-Six Dramatic Situations. Étienne Souriau reduced them to only 6 positions named "dramaturgic functions" with astrological symbols:
- "The Leo", the thematic powered.
- "The Sun", the valued.
- "The Earth", the wished obtainer.
- "The Mars", the oppositionist.
- "The Libra", the judge of the situation.
- "The Moon", Auxiliary.
 See also
|Look up actant in Wiktionary, the free dictionary.|
- Greimas, Algirdas Julien  Structural Semantics: An Attempt at a Method
- Greimas (1973) "Actants, Actors, and Figures." On Meaning: Selected Writings in Semiotic Theory. Trans. Paul J. Perron and Frank H, Collins. Theory and History of Literature, 38. Minneapolis: U of Minnesota P, 1987. 106-120.
- (cf. "On actor-network theory. A few clarifications", Soziale Welt, 47, 1996, p. 369-382)
- Georges Polti, Les XXXVI situations dramatiques, in French 1895.
- Étienne Souriau, Les deux cent mille situations dramatiques, in French 1950.
- Vladimir Propp, Morphologie du conte, in French 1928.
- Lucien Tesnière, Éléments de syntaxe structurale, in French 1959, 2nd ed. 1966.
- Algirdas Julien Greimas, Sémantique structurale, in French 1966.
- ---. 1973. "Actants, Actors, and Figures." On Meaning: Selected Writings in Semiotic Theory. Trans. Paul J. Perron and Frank H, Collins. Theory and History of Literature, 38. Minneapolis: University of Minnesota Press, 1987. 106-120.
- Julia Kristeva, Le texte du roman, in French 1967.