continuum

Etymology

It is borrowed from Latin continuum (“a continuous thing”), the neuter of continuus (“joining, connecting; following one after another”) used as a noun.^{[2][3][4][5][6]} The adjective comes from contineō, which in its intransitive use meant "to be uninterrupted", literally "to hang together";^[2] the verb is formed from com- (“with, together”) and teneō (“to hold”), from Proto-Indo-European *ten- (“to stretch”).^[2] It is related to continuous, continue and contain.^[2][4][7]

Earliest recorded meaning

A continuous extension, a connection of parts as close as that of the instants of time: Etymonline dates it to the 1640s.^[2] Merriam-Webster dates the first use to 1646,^[7] and the OED's first quotation, of a continuous thing or quantity, is from Sir Thomas Browne's Pseudodoxia Epidemica in 1650.^[3]

Semantic evolution

The word entered English as a term of philosophy and natural science for a continuous thing, quantity or substance, or a series of elements that pass into one another.^[3][5] In mathematics it came to mean the set of real numbers, or a set with as many points as the real numbers in an interval.^[4][5] In physics the OED records the phrase space-time continuum.^[3][5] In general use it now names a range or sequence in which neighbouring parts differ only slightly, while its ends are clearly distinct.^[8][9][4] The Latin plural continua is still used beside continuums.^[2][7][9]

Timeline

• 1640s – a continuous extension.^[2][6]
• 1646 – first known use in Merriam-Webster.^[7][8]
• 1650 – a continuous thing, quantity or substance, in Sir Thomas Browne.^[3]

Meanings

Noun

1. A continuous series or whole whose parts cannot be told apart from their neighbours except by an arbitrary division, though its ends differ: The two dialects form a continuum along the coast.^[4][9][8]
2. (mathematics) The set of all real numbers, or a set with as many points as the real numbers in an interval.^[4][5]
3. A continuous thing, quantity or substance, as in space-time continuum.^[3][5]

Word family

• continuum hypothesis

Related words

• continuous
• continue
• continual
• continuity
• contain

References

1. ^ Wiktionary, the free dictionary, https://en.wiktionary.org
2. ^ a b c d e f g Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
3. ^ a b c d e f Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
4. ^ a b c d e f The American Heritage Dictionary of the English Language (online 2024), 5th ed., Boston: Houghton Mifflin Harcourt
5. ^ a b c d e f Shorter Oxford English Dictionary on Historical Principles (2002), 5th ed., ed. William R. Trumble and Angus Stevenson, Oxford: Oxford University Press
6. ^ a b Dictionary.com Unabridged (2016), based on the Random House Unabridged Dictionary, New York: Random House
7. ^ a b c d Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
8. ^ a b c Merriam-Webster's Collegiate Dictionary (2003), 11th ed., Springfield, Mass.: Merriam-Webster
9. ^ a b c Collins English Dictionary (2023), Glasgow: HarperCollins