con·ver·sion
 /kənˈvɚʒən, Brit kənˈvəːʃən/  noun  ,  pl   -sions
  1 a : the act or process of changing from one form, state, etc., to another — often + to or into
   [  count  ] The company is undergoing a conversion to a new computer system.
   [  noncount  ] They have suggested conversion of the old school into apartments.
    Conversion to gas heating will continue over the next few years.
  1 b : the act or process of changing from one religion, belief, political party, etc., to another — often + to
   [  count  ] a conversion from Catholicism to Judaism
   [  noncount  ] He is thinking about conversion to Buddhism.
  2 [  count  ]
  2 a : a successful attempt at scoring extra points in rugby or American football
   a 2-point conversion
  2 b American football : a successful attempt to move the ball forward 10 yards
   a third-down conversion