Important events, achievements, or points in time that mark significant progress or change.
From literal mile markers—stones placed along roads showing distance in miles. The term comes from 'mile' (Latin 'milia passuum,' meaning 'thousand paces') and 'stone.' By the 1800s, 'milestone' became metaphorical for any significant point marking progress in life or history.
Ancient Roman roads were literally lined with stone markers showing distance, and the word 'milestone' is one of the few terms where the metaphorical meaning (life achievements) is now more common than the original literal meaning (road stones)! Today's GPS has made physical milestones obsolete, but the word lives on in psychology and business.
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