breakthrough

Etymology

It is formed from the phrasal verb from English break + through.^[2][3][4] The verbal phrase, "to force a way past a barrier", goes back to about 1400.^[3] The OED compares Middle High German durchbruch (“insight, revelation”) and Dutch doorbraak (“breach”).^[2]

Earliest recorded meaning

An act of breaking through a physical barrier: 1859, in T. J. Page's La Plata.^[2] Etymonline and Merriam-Webster date the noun from 1918, in its military sense.^[3][5]

Semantic evolution

In coal mining a breakthrough was a narrow passage cut through a pillar to improve the circulation of air (1876).^[2] The First World War made the word common for an offensive that breaks through the enemy's defensive line (1915),^[2][3] and sport took over the idea for an attack through the other side's defence (1920).^[2] From the notion of a successful attack came the figurative "sudden advance in knowledge" or "development that removes an obstacle",^[3] recorded from 1943,^[2] and a first notable success in a career (1970).^[2] In medicine, a breakthrough infection occurs despite vaccination or preventive treatment (1944).^[2]

Timeline

• c. 1400 – the verbal phrase break through.^[3]
• 1859 – an act of breaking through a barrier.^[2]
• 1876 – in coal mining, a passage through a pillar.^[2]
• 1915 – a military offensive that breaks through a line.^[2]
• 1918 – Etymonline's and Merriam-Webster's first date.^[3][5]
• 1943 – a sudden important advance.^[2]
• 1944 – a disease occurring despite preventive treatment.^[2]
• 1955 – the adjective, representing a major advance.^[2]

Modern meaning

Noun

1. A sudden and important discovery or development that allows further progress.
2. An act of forcing a way through an obstacle or a restriction.
3. A military offensive that penetrates the enemy's defences.
4. A first important success in someone's career or field.

Adjective

1. Representing a major advance or a first notable success.
2. (medicine) Of an infection or symptom: occurring despite vaccination or preventive treatment.

Related words

• break
• through
• breakout

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 d e f g 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 Merriam-Webster's Collegiate Dictionary (2003), 11th ed., Springfield, Mass.: Merriam-Webster