Variable and Irregular

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.

noun

• A member of an irregular armed force that fights a stronger force by sabotage and harassment.
  • synonyms: guerrilla, guerilla, insurgent
• Merchandise that has imperfections; usually sold at a reduced price without the brand name.
  • synonyms: second

adjective

• Contrary to rule or accepted order or general practice.
  • usage: "irregular hiring practices"
• Not occurring at expected times.
  • synonyms: unpredictable
• Used of the military. ( not belonging to or engaged in by regular army forces)
  • usage: "irregular troops"; "irregular warfare"
• Of solids. ( not having clear dimensions that can be measured; volume must be determined with the principle of liquid displacement)
• Falling below the manufacturer's standard.
  • usage: "irregular jeans"
• Deviating from normal expectations; somewhat odd, strange, or abnormal.
  • usage: "these days large families are atypical"; "atypical clinical findings"; "atypical pneumonia"; "highly irregular behavior"
  • synonyms: atypical
• Lacking continuity or regularity.
  • usage: "an irregular worker"; "employed on a temporary basis"
  • synonyms: temporary
• Of a surface or shape. (; not level or flat or symmetrical)
  • usage: "walking was difficult on the irregular cobblestoned surface"
• Independent in behavior or thought.
  • usage: "she led a somewhat irregular private life"; "maverick politicians"
  • synonyms: maverick, unorthodox

• (n.) One who is not regular; especially, a soldier not in regular service.
• (a.) Not regular; not conforming to a law, method or usage recognized as the general rule; not according to common form; not conformable to nature, to the rules of moral rectitude or to established principles; not normal; unnatural; immethodical; unsymmetrical; erratic; no straight; not uniform; as, an irregular line; an irregular figure; an irregular verse; an irregular physician; an irregular proceeding; irregular motion; irregular conduct, etc. Cf. Regular.