Retrograde

• Retrograde motion
  Retrograde motion
  Retrograde motion is motion in the direction opposite to the movement of something else, and is the contrary of direct or prograde motion. This motion can be the orbit of one body about another body or about some other point, or the rotation of a single body about its axis, or other phenomena such...
  
  , in astronomy, describes retrograde motions of celestial bodies relative to a gravitationally central object
• Apparent retrograde motion, in astronomy, is the apparent motion of planets as observed from a particular vantage point
• Retrograde metamorphism, in geology, describes a somewhat rare recrystalization of rocks under decreasing pressure and/or temperature conditions.
• Retrograde ejaculation
  Retrograde ejaculation
  In the human male reproductive system, retrograde ejaculation occurs when semen, which would normally be ejaculated via the urethra, is redirected to the urinary bladder. Normally, the sphincter of the bladder contracts before ejaculation forcing the semen to exit via the urethra, the path of least...
  
  , in medicine
• Retrograde amnesia
  Retrograde amnesia
  Retrograde amnesia is a loss of access to events that occurred, or information that was learned, before an injury or the onset of a disease....
  
  , in neuroscience / medicine, is a type of amnesia
• Retrograde signaling
  Retrograde signaling
  In neuroscience, retrograde signaling is a phenomenon in which a signal travels from a postsynaptic neuron to a presynaptic one. Endocannabinoids are known to play a role in retrograde signaling, with the molecules being synthesized postsynaptically and acting presynaptically...
  
  , in neuroscience
• Retrograde inversion
  Retrograde inversion
  Retrograde inversion is a musical term that literally means "backwards and upside down": "The inverse of the series is sounded in reverse order." This is a technique used in music, specifically in twelve-tone technique, where the inversion and retrograde techniques are performed on the same tone...
  
  , a type of musical permutation
• Retrograde analysis
  Retrograde analysis
  In chess, retrograde analysis is a computational method used to solve game positions for optimal play by working backward from known outcomes , such as the construction of endgame tablebases. In game theory at large, this method is called backward induction...
  
  , in chess problems
• Retrograde (music)
  Retrograde (music)
  A musical line which is the reverse of a previously or simultaneously stated line is said to be its retrograde or cancrizans. An exact retrograde includes both the pitches and rhythms in reverse. An even more exact retrograde reverses the physical contour of the notes themselves, though this is...
  
  , in music
• Retrograde (videogame), in entertainment, a shooter published in 1989 by Thalamus Ltd
  Thalamus Ltd
  Thalamus Ltd was a British computer game developer that published titles for a number of 8-bit and 16-bit platforms during the late 1980s and early 1990s.-Genesis:...
  
   for the Commodore64
• Retro/Grade
  Retro/Grade
  Retro/Grade is a video game developed by 24 Caret Games. The game is about ace pilot, Rick Rocket, who must repeat his last space battle in reverse in order to protect the space time continuum. The game play is rhythm-based and timed to original music by Skyler McGlothlin...
  
  , in entertainment, a music video game under development for the PlayStation 3 by 24 Caret Games

Retrogradation

• Retrogradation
  Retrogradation
  Retrogradation is the term for the landward change in position of the front of a river delta with time. This occurs when the mass balance of sediment into the delta is such that the volume of incoming sediment is less than the volume of the delta that is lost through subsidence, sea-level rise,...
  
  , a landward change in position of the front of a river delta with time.
• Retrogradation (starch)
  Retrogradation (starch)
  Retrogradation is a reaction that takes place in gelatinized starch when the amylose and amylopectin chains realign themselves, causing the liquid to gel....
  
  , the gelatinized of starch when the amylose and amylopectin chains realign themselves