milestone

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noun mile·stone \ˈmī(-ə)l-ˌstōn\

Definition of milestone

  1. 1 :  a stone serving as a milepost (see milepost 1)

  2. 2 :  a significant point in development <Graduating from college was an important milestone in her life.>

Examples of milestone in a sentence

  1. <the new drug was regarded as a milestone in the treatment of heart disease>

1662

First Known Use of milestone

1662

Other Transportation Terms


MILESTONE Defined for English Language Learners

milestone

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noun mile·stone \ˈmī(-ə)l-ˌstōn\

Definition of milestone for English Language Learners

  • : a stone by the side of a road that shows the distance in miles to a specified place

  • : an important point in the progress or development of something : a very important event or advance


MILESTONE Defined for Kids

milestone

play
noun mile·stone \ˈmīl-ˌstōn\

Definition of milestone for Students

  1. 1 :  a stone by the side of a road showing the distance in miles to a given place

  2. 2 :  an important point in progress or development <His discovery was a major milestone in scientific research.>



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