Altermodern, a portmanteau word defined by Nicolas Bourriaud, is an attempt at contextualizing art made in today's global context as a reaction against standardisation and commercialism. It is also the title of the Tate Britain's fourth Triennial exhibition curated by Bourriaud.
In his keynote speech to the 2005 Art Association of Australia & New Zealand Conference, Nicolas Bourriaud explained:
"Artists are looking for a new modernity that would be based on translation: What matters today is to translate the cultural values of cultural groups and to connect them to the world network. This “reloading process” of modernism according to the twenty-first-century issues could be called altermodernism, a movement connected to the creolisation of cultures and the fight for autonomy, but also the possibility of producing singularities in a more and more standardized world."
Altermodern can essentially be read as an artist working in a hypermodern world or with supermodern ideas or themes.
Tate Britain 2009 
The Tate exhibition includes a series of four one-day events (called "Prologues"), aiming to "introduce and provoke debate" around the Triennial’s themes. Each Prologue includes lectures, performances, film and a manifesto text and attempts to define what the curator sees as the four main facets of Altermodern 
- The end of postmodernism
- Cultural hybridisation
- Travelling as a new way to produce forms[clarification needed]
- The expanding formats of art
- The Art Association of Australia & New Zealand: Modern, Postmodern, Altermodern?
- http://www.tate.org.uk/britain/eventseducation/musicperform/tatetriennial2009prologue1altermodern.htm Tate Triennial 2009 Prologue 1: Altermodern
- http://www.tate.org.uk/britain/eventseducation/talks/tatetriennial2009prologue2.htm Tate Triennial 2009 Prologue 2: Exiles
- http://www.tate.org.uk/britain/eventseducation/film/tatetriennial2009prologue3travels.htm Tate Triennial 2009 Prologue 3: Travels