jouissance: the French word for 'enjoyment' (often used in sexual sense), employed by the critic Roland Barthes in his Le Plaisir du texte (1973) to suggest a kind of response to literary response that is different from ordinary plaisir (pleasure). Whereas plaisir is comfortable and reassuring, jouissance - usually translated as 'bliss' to retain its erotic sense - is unsettling and destabilizing. More information may be found here on wikipedia. The distinction corresponds to a further distinction Barthes makes between texte lisible (readable text) and texte scriptible (writable text).

Again this word also has a strong connotation in Psychology due to Jacques Lacan, and more may be read here.