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English definition of “milestone”

milestone

noun [C]
 
 
/ˈmaɪlstəʊn/
(also milepost) an important event in the development or history of something or in someone's life: The opening of a branch in New York represented an important milestone for the company.a milestone in sth They described the discovery as 'a milestone in medical research'.
a time when a piece of work must be finished or something must be achieved: In Monday mornings, we would set milestones for the week. If they don't meet the first milestone, you withdraw support.
(Definition of milestone from the Cambridge Business English Dictionary © Cambridge University Press)
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