Value

1. （Noun）
   
   An amount, as of goods, services, or money, considered to be a fair and suitable equivalent for something else; a fair price or return.
• Value in Mathematics:
  
  A quantity or number expressed by an algebraic term.
• Value in Music:
  
  The relative duration of a tone or rest.
• Value in Color:
  
  The relative darkness or lightness of a color.
• Linguistics:
  
  The sound quality of a letter or diphthong.
2. （Wikipedia）
   
   In ethics and social sciences,value denotes the degree of importance of something or action, with the aim of determining which actions are best to do or what way is best to live, or to describe the significance of different actions.
   
   Value systems are prospective and prescriptive beliefs; they affect the ethical behavior of a person or are the basis of their intentional activities.
   
   Often primary values are strong and secondary values are suitable for changes. What makes an action valuable may in turn depend on the ethical values of the objects it increases, decreases, or alters.
   
   An object with "ethic value" may be termed an "ethic or philosophic good" (noun - sense).