ecology

Etymology

It is borrowed from German Ökologie (earlier spelled with an initial diphthong),^{[2][3][4][5][6]} a term coined by the German zoologist Ernst Haeckel in a work of 1866^[2][7][8][9] from οἶκος (oîkos, “house, dwelling”) and the German ending that corresponds to -logy.^[2][4][10] Haeckel used the Greek noun in the wider sense "habitat".^[8][5] The Greek word goes back to the Indo-European root Proto-Indo-European *weyḱ- (“clan, settlement”),^[7][4] and is also the source of economy.^[8]

Earliest recorded meaning

The branch of science dealing with living things and their surroundings: 1873 in Etymonline and Merriam-Webster, in the spelling oecology;^[7][3] the revised OED's first quotation is from 1875.^[2] Barnhart dates the word to 1858, in a letter of Thoreau,^[11] but the OED explains that this is a misreading of geology.^[2] French écologie is recorded about 1874.^[2]

Semantic evolution

The quasi-Latin spelling oecology was used at first,^[8][7] and the e- spelling later prevailed.^[2] The word came to mean the relationships themselves as well as their study.^[2][6] Sociologists applied it from 1908 to the relations between human groups and their environment,^[2][6] and since 1976 it was used of the interplay between any system and its surroundings.^[2] Etymonline dates its use in connection with campaigns against pollution to the 1960s,^[7] and the OED records the sense "concern for the environment, environmentalism as a political movement" from 1970.^[2]

Timeline

• 1866 – the German word, coined by Haeckel.^[2]
• 1873 – oecology.^[7][3]
• 1875 – the OED's first quotation.^[2]
• 1908 – (sociology) human ecology.^[2]
• 1970 – environmentalism.^[2]
• 1976 – any system and its environment.^[2]

Modern meaning

Noun

1. The branch of biology that studies how living organisms relate to one another and to their environment.
2. The pattern of such relationships in a particular place or for a particular organism: the fragile ecology of the salt marsh.
3. The study of how human groups relate to their physical and social surroundings.
4. Concern for the protection of the natural environment; environmentalism.

Word family

• ecological
• ecologically
• ecologist
• agroecology
• autecology
• bioecology
• eco-
• ecosystem

Related words

• economy
• environment

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 p Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
3. ^ a b c Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
4. ^ a b c The American Heritage Dictionary of the English Language (online 2024), 5th ed., Boston: Houghton Mifflin Harcourt
5. ^ a b Hoad, T. F., ed. (1986), The Concise Oxford Dictionary of English Etymology, Oxford: Clarendon Press
6. ^ a b c Collins English Dictionary (2023), Glasgow: HarperCollins
7. ^ a b c d e f Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
8. ^ a b c d Ayto, John (2005), Word Origins: The Secret Histories of English Words from A to Z, 2nd ed., London: A & C Black
9. ^ Cresswell, Julia (2021), Oxford Dictionary of Word Origins, 3rd ed., Oxford: Oxford University Press
10. ^ Klein, Ernest. A Comprehensive Etymological Dictionary of the English Language. 2 vols. Amsterdam: Elsevier, 1966–1967.
11. ^ Barnhart, Robert K. (1988), The Barnhart Dictionary of Etymology