GNU Collaborative International Dictionary of English
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Found one definition
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Milestone (?), n.
1. A stone serving the same purpose as a milepost.
[1913 Webster]
2. An event or accomplishment marking a significant advance in an endeavor; a notable achievment; as, “putting a man in orbit was a major milestone on the way to the moon”.
Syn. -- milepost.
[PJC]