milestone

IPA: mˈaɪɫstoʊn

A stone milepost (or by extension in other materials), one of a series of numbered markers placed along a road at regular intervals, typically at the side of the road or in a median.
(idiomatic) An important event in a person's life or career, in the history of a nation, in the life of some project, etc.

Examples of "milestone" in Sentences

Congraulations Scott, I think this milestone is a testament to all your hard work.
An African Union official is hailing what he called a milestone for peacekeeping efforts in Darfur.
Analysts say the milestone is a “confidence booster” and “reinforces the growing belief on Wall Street that the recovery in the economy and markets remains on track.”
Mrs Clinton urged members of the group to abandon violence and rejoin society following bin Laden's death, which she described as a "milestone" in the war on terrorism.
Even so, proponents of same-sex marriage celebrated the judge's ruling, taking to the streets of Phoenix to hail what they called a milestone in their quest for equal treatment.
Alas, our poor little 'inscription,' so far as I remember it, was not more criminal than that of a number on a milestone; in fact the whole adventure was like that of setting up an authentic _milestone_ in a tract of country
Tunica County Planning Director Pepper Bradford said the last sections of the community will be opened sometime Monday in what he called a milestone for the roughly 225 households that are permanent residences in a series of fishing camps.