Velocity



GRE Barron TOEFL 考研

解释

GRE 红宝书

• n.速度; 迅速
• ［英］ n.速度 ( quickness of motion;speed) ; 迅速 ( rapidity of movement)
• ［记］ veloc ( 速度) +ity
• ［例］ the velocity of historical change ( 历史变迁的迅速)

Webster Collegiate

noun (plural -ties)

• Etymology: Middle French velocité, from Latin velocitat-, velocitas, from veloc-, velox quick; probably akin to Latin vegēre to enliven — more at wake
• Date: 15th century
• 1.
  • a. quickness of motion ; speed <the velocity of sound>
  • b. rapidity of movement <\［my horse's\］ strong suit is grace & personal comeliness, rather than velocity — Mark Twain>
  • c. speed imparted to something <the power pitcher relies on velocity — Tony Scherman>
• 2. the rate of change of position along a straight line with respect to time ; the derivative of position with respect to time
• 3.
  • a. rate of occurrence or action ; rapidity <the velocity of historical change — R. J. Lifton>
  • b. rate of turnover <the velocity of money>

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