Hypertext Webster Gateway: "milestone"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Milestone \Mile"stone`\, n.
A stone serving the same purpose as a milepost.
From WordNet (r) 1.7 (wn)
milestone
n 1: stone post at side of a road to show distances [syn: {milepost}]
2: a significant event in your life (or in a project)
Additional Hypertext Webster Gateway Lookup
Gateway by dict@stokkie.net
stock only wrote the gateway and does not have any control over the contents;
see the Webster Gateway FAQ,
and also the Back-end/database links and credits.