Variable and Changing

noun

• Something that is likely to vary; something that is subject to variation.
  • usage: "the weather is one variable to be considered"
• A quantity that can assume any of a set of values.
  • synonyms: variable quantity
• A star that varies noticeably in brightness.
  • synonyms: variable star
• A symbol (like x or y) that is used in mathematical or logical expressions to represent a variable quantity.

adjective

• Liable to or capable of change.
  • usage: "rainfall in the tropics is notoriously variable"; "variable winds"; "variable expenses"
• Marked by diversity or difference.
  • usage: "the varying angles of roof slope"; "nature is infinitely variable"
  • synonyms: varying
• Used of a device) designed so that a property (as e. G. Light) can be varied. (
  • usage: "a variable capacitor"; "variable filters in front of the mercury xenon lights"

• (n.) Those parts of the sea where a steady wind is not expected, especially the parts between the trade-wind belts.
• (n.) That which is variable; that which varies or is subject to change.
• (a.) Liable to vary; too susceptible of change; mutable; fickle; unsteady; inconstant; as, the affections of men are variable; passions are variable.
• (n.) A quantity which may increase or decrease; a quantity which admits of an infinite number of values in the same expression; a variable quantity; as, in the equation x2 - y2 = R2, x and y are variables.
• (a.) Having the capacity of varying or changing; capable of alternation in any manner; changeable; as, variable winds or seasons; a variable quantity.
• (n.) A shifting wind or one that varies in force.

Variable is an element in a model. For example, in the model RS&Pt+1 = a + b Tbill t + et, where RS&Pt+1 is the return on the S&P in month t+1 and Tbill is the Tbill return at month t, both RS&P and Tbill are "variables" because they change through time; i. E., they are not constant.

verb

• Cause to change; make different; cause a transformation.
  • usage: "The advent of the automobile may have altered the growth pattern of the city"; "The discussion has changed my thinking about the issue"
  • synonyms: change, alter, modify
• Undergo a change; become different in essence; losing one's or its original nature.
  • usage: "She changed completely as she grew older"; "The weather changed last night"
  • synonyms: change
• Become different in some particular way, without permanently losing one's or its former characteristics or essence.
  • usage: "her mood changes in accordance with the weather"; "The supermarket's selection of vegetables varies according to the season"
  • synonyms: change, alter, vary
• Lay aside, abandon, or leave for another.
  • usage: "switch to a different brand of beer"; "She switched psychiatrists"; "The car changed lanes"
  • synonyms: switch, shift, change
• Change clothes; put on different clothes.
  • usage: "Change before you go to the opera"
  • synonyms: change
• Exchange or replace with another, usually of the same kind or category.
  • usage: "Could you convert my dollars into pounds"; "He changed his name"; "convert centimeters into inches"; "convert holdings into shares"
  • synonyms: change, exchange, commute, convert
• Give to, and receive from, one another.
  • usage: "Would you change places with me"; "We have been exchanging letters for a year"
  • synonyms: exchange, change, interchange
• Change from one vehicle or transportation line to another.
  • usage: "She changed in Chicago on her way to the East coast"
  • synonyms: transfer, change
• Become deeper in tone.
  • usage: "His voice began to change when he was 12 years old"; "Her voice deepened when she whispered the password"
  • synonyms: deepen, change
• Remove or replace the coverings of.
  • usage: "Father had to learn how to change the baby"; "After each guest we changed the bed linens"
  • synonyms: change

adjective

• Marked by continuous change or effective action.
  • synonyms: ever-changing