heterogeneous

Etymology

It is borrowed from Medieval Latin heterogeneus,^{[2][3][4][5][6]} from Ancient Greek ἑτερογενής (heterogenḗs, “of different kinds”),^[3][7][8] formed from ἕτερος (héteros, “other, different”) and γένος (génos, “kind, race, gender, stock”),^[2][3][6][9] with the English suffix -ous.^[7][3] The OED calls the Latin source Scholastic Latin.^[7] Etymonline and the American Heritage Dictionary trace génos to Proto-Indo-European *gene- (“to give birth, beget”).^[2][4] The same Greek prefix and noun, with homo- in place of hetero-, give its opposite homogeneous.^[10][6]

Earliest recorded meaning

Diverse in kind or nature, completely different: 1624, in a reply by Bishop Francis White to the Jesuit Fisher.^[7][3][5] Etymonline dates it to the 1620s,^[2] and Dictionary.com to 1615–25.^[11]

Semantic evolution

Heterogeneous gradually replaced the earlier heterogeneal (1605), formed from the same Latin word with -al,^[3][7] which in turn followed heterogene (1541).^[3] It was first said of things compared with one another, as being of entirely different kinds;^[7] from 1629 it was also said of a single thing composed of unlike parts, the opposite of homogeneous.^[7][8] Johnson (1755) defined it as "not kindred; opposite or dissimilar in nature".^[12] Mathematicians used it from 1656 of quantities of different kinds that cannot be compared,^[7] and chemists from 1878 used it of a system with more than one phase, solid, liquid or gas.^[7][8] A loose sense, extraordinary or abnormal, recorded from 1760, is now rare.^[7][8]

Timeline

• 1605 – the earlier form heterogeneal.^[3][7]
• 1624 – of things compared: diverse in kind, incongruous.^[7][3][5]
• 1629 – composed of parts of different kinds; not homogeneous.^[7]
• 1656 – in mathematics, of different kinds and so incommensurable.^[7]
• 1760 – loosely, extraordinary, abnormal.^[7]
• 1878 – in chemistry, involving more than one phase.^[7]

Meanings

Adjective

1. Made up of dissimilar or unrelated parts or elements; diverse in character or content: The museum holds a heterogeneous collection of tools, coins and toys.^[13][5][14]
2. Differing in kind; not of the same type: a heterogeneous group of patients.^[5][13][7]
3. (chemistry) Involving or made up of more than one phase (solid, liquid or gas): heterogeneous catalysis.^[13][14][7]
4. (mathematics) Of different kinds, degrees or dimensions, and so not commensurable.^[14][7]

Word family

• heterogeneously
• heterogeneousness

Related words

• heterogenous
• heterogeneity
• homogeneous
• heterodox
• gene
• genus

Usage notes

The form heterogenous is also used for the first sense;^[15] Wiktionary calls it the less common form.^[1]

References

1. ^ a b c Wiktionary, the free dictionary, https://en.wiktionary.org
2. ^ a b c d Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
3. ^ a b c d e f g h i Barnhart, Robert K. (1988), The Barnhart Dictionary of Etymology
4. ^ a b The American Heritage Dictionary of the English Language (online 2024), 5th ed., Boston: Houghton Mifflin Harcourt
5. ^ a b c d e Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
6. ^ a b c Klein, Ernest. A Comprehensive Etymological Dictionary of the English Language. 2 vols. Amsterdam: Elsevier, 1966–1967.
7. ^ a b c d e f g h i j k l m n o p q r s Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
8. ^ a b c d Shorter Oxford English Dictionary on Historical Principles (2002), 5th ed., ed. William R. Trumble and Angus Stevenson, Oxford: Oxford University Press
9. ^ Stevenson, Angus, ed. (2010), Oxford Dictionary of English, 3rd ed., Oxford: Oxford University Press
10. ^ Cresswell, Julia (2021), Oxford Dictionary of Word Origins, 3rd ed., Oxford: Oxford University Press
11. ^ Dictionary.com Unabridged (2016), based on the Random House Unabridged Dictionary, New York: Random House
12. ^ Johnson, Samuel (1755), A Dictionary of the English Language, London; 4th ed. 1773; Johnson's Dictionary Online, ed. Beth Rapp Young et al.
13. ^ a b c Collins English Dictionary (2023), Glasgow: HarperCollins
14. ^ a b c Pearsall, Judy, ed. (1998), The New Oxford Dictionary of English, Oxford: Clarendon Press
15. ^ The American Heritage Dictionary of the English Language (2000), 4th ed., Boston: Houghton Mifflin