Mathematics

• Expansion (geometry)
  Expansion (geometry)
  In geometry, expansion is a polytope operation where facets are separated and moved radially apart, and new facets are formed at separated elements...
  
  
• Polynomial expansion
  Polynomial expansion
  In mathematics, an expansion of a product of sums expresses it as a sum of products by using the fact that multiplication distributes over addition...
  
  
• Taylor expansion
• expansion of a graph
  Expander graph
  In combinatorics, an expander graph is a sparse graph that has strong connectivity properties, quantified using vertex, edge or spectral expansion as described below...
  
  
• The converse of a reduct
  Reduct
  In universal algebra and in model theory, a reduct of an algebraic structure is obtained by omitting some of the operations and relations of that structure...
  
  , in model theory or universal algebra

Other uses

• Expansion card
  Expansion card
  The expansion card in computing is a printed circuit board that can be inserted into an expansion slot of a computer motherboard or backplane to add functionality to a computer system via the expansion bus.One edge of the expansion card holds the contacts that fit exactly into the slot...
  
  , in computer hardware
• Expansion pack
  Expansion pack
  An expansion pack, expansion set, or supplement is an addition to an existing role-playing game, tabletop game or video game. These add-ons usually add new game areas, weapons, objects, and/or an extended storyline to a complete and already released game...
  
  , in gaming
• Expansion team
  Expansion team
  An expansion team is a brand new team in a sports league. The term is most commonly used in reference to the North American major professional sports leagues, but is applied to sports leagues worldwide that use a closed franchise system of league membership. The term comes from the expansion of the...
  
  , in sports
• Trinucleotide repeat expansion disorder, in medicine, the result of expansion during DNA translation
• Expansion (album)
  Expansion (album)
  Expansion is a live album released by jazz pianist Dave Burrell. It was recorded during a number of concerts in December 2003 and was released on June 8, 2004 by High Two....
  
  , by Dave Burrell
• Expansions (album)
  Expansions (album)
  Expansions is the tenth album by jazz pianist McCoy Tyner and his fourth released on the Blue Note label. It was recorded in August 1968 and features performances by Tyner with Woody Shaw, Gary Bartz, Wayne Shorter, Ron Carter, Herbie Lewis, and Freddie Waits...
  
  , an album by jazz pianist McCoy Tyner
• Expansion joint
  Expansion joint
  An expansion joint or movement joint is an assembly designed to safely absorb the heat-induced expansion and contraction of various construction materials, to absorb vibration, to hold certain parts together, or to allow movement due to ground settlement or earthquakes...
  
  , in engineering
• Audio level expansion, in audio engineering
  Audio engineering
  An audio engineer, also called audio technician, audio technologist or sound technician, is a specialist in a skilled trade that deals with the use of machinery and equipment for the recording, mixing and reproduction of sounds. The field draws on many artistic and vocational areas, including...
  
  

• Expansion life,in nature