milestone

Etymology

It is formed from English mile + stone.^{[2][3][4][5][6]} The mile goes back through Old English mīl to Latin mīlia (“thousands”), the plural of mīlle (“a thousand”), and stone to Old English stān, from Proto-Germanic *stainaz.^[3] The OED notes that the compound appears earlier in place names, as “Mylestone” (1371) and “Mylez Stone” (before 1547), now Milestone Wood in Sussex.^[2]

Earliest recorded meaning

A stone or short pillar set up beside a road to show the distance in miles to a place: 1662, in Dugdale's History of Imbanking and Drayning.^[2][7] Etymonline dates it to 1746,^[3] and Dictionary.com to 1740–50.^[5]

Semantic evolution

Johnson (1755) defined it simply as a stone set to mark the miles.^[6] The figurative sense, a significant stage in the development of a society, a career or a person, is recorded from 1820, in a letter of John Clare.^[2][8] In American project planning it took the sense of a stage to be reached by a set date, a target (1958),^[2] and since 1972 the noun has also been used attributively, of an important or influential event.^[2] The verb, to mark as if with milestones, dates from 1868.^[2][8] In early 19th-century slang a milestone was a country bumpkin, from the stones standing beside the road,^[2][9] and in naval slang it is a kind of rough sea (1946).^[2]

Timeline

• 1371 – Mylestone, as a place name.^[2]
• 1662 – a stone beside a road marking the distance in miles.^[2][7]
• 1812 – slang, a country bumpkin (obsolete).^[9]
• 1820 – figurative, a significant stage in a process or life.^[2][8]
• 1868 – verb, to mark as if with milestones.^[2]
• 1958 – a stage to be reached in a project by a set date (originally U.S.).^[2]
• 1972 – attributive, constituting an important stage.^[2]

Modern meaning

Noun

1. An important event or stage in a life, a history or a development: Her first solo exhibition was a milestone in her career.
2. A stone or pillar beside a road that shows the distance in miles to a place; a milepost.
3. A stage to be reached in a project by a set date.

Verb

1. To mark with milestones, or as if with them.

Related words

• mileage
• milepost
• mile
• stone

References

1. ^ a b Wiktionary, the free dictionary, https://en.wiktionary.org
2. ^ a b c d e f g h i j k l m n o Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
3. ^ a b c Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
4. ^ Shorter Oxford English Dictionary on Historical Principles (2002), 5th ed., ed. William R. Trumble and Angus Stevenson, Oxford: Oxford University Press
5. ^ a b Dictionary.com Unabridged (2016), based on the Random House Unabridged Dictionary, New York: Random House
6. ^ a b Johnson, Samuel (1755), A Dictionary of the English Language, London; 4th ed. 1773; Johnson's Dictionary Online, ed. Beth Rapp Young et al.
7. ^ a b Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
8. ^ a b c Kay, Christian; Roberts, Jane; Samuels, Michael; Wotherspoon, Irené, eds. (2009), Historical Thesaurus of the Oxford English Dictionary, Oxford: Oxford University Press; online edition (2024)
9. ^ a b Green, Jonathon (2010), Green's Dictionary of Slang, London: Chambers; digital ed. 2016–, https://greensdictofslang.com