Etymologically
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plain

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Pronunciation

  • IPA: /pleɪn/[1]

Etymology

It is inherited from Middle English playne, pleyn, borrowed from Old French plain (“flat, smooth, even”),[2][3][4] from Latin plānus (“flat, even, level”),[2][3] from Proto-Indo-European *pele- (“flat; to spread”), the source also of Lithuanian plónas “thin”.[2][3] The noun, a stretch of flat land, is from Old French plain, from Latin plānum, the neuter of plānus used as a noun.[3][5][2] It is a doublet of plane “a level surface” and of plan.[3][6]

Earliest recorded meaning

Smooth, flat, straight: about 1300 in Barnhart and Etymonline.[3][2] The noun, a flat stretch of land, is also from about 1300, first used of Salisbury Plain.[2][3]

Semantic evolution

“Open, clear, pure, simple” is from before 1325, and “sincere, honest” from about 1375.[3] “Ordinary, unaffected” is first in Chaucer, about 1386,[3] and of dress, without decoration, from the late 14th century.[2] Of words and speech, direct and to the point, is from the late 14th century,[2] and plain English from about 1500.[2] As a euphemism for “not good-looking” it dates from 1749.[2] In the early 17th century mathematicians began to spell the geometrical sense plane to keep it apart from the senses “ordinary” and “simple”.[6] The Plains of North America are from 1755,[3] and plain clothes, civilian dress, from 1822.[3]

Timeline

  • c. 1300 – flat, smooth; noun, a level tract.[3][2]
  • c. 1375 – honest.[3]
  • c. 1386 – ordinary.[3]
  • c. 1500 – plain English.[2]
  • 1749 – not good-looking.[2]
  • 1755 – the Plains of America.[3]
  • 1822 – plain clothes.[3]

Modern meaning

Adjective

  1. Easy to see or understand; obvious.
  2. Simple, without decoration or pattern.
  3. Honest and direct in speech.
  4. Not mixed with anything: plain water.
  5. Ordinary, not special in rank.
  6. Not attractive to look at.

Noun

  1. A large area of flat land with few trees.

Adverb

  1. Clearly or simply: plain stupid.

Word family

  • plainly
  • plainness
  • overplain
  • plainchant
  • plainspoken
  • plain-saw
  • plain-woven
  • plain-laid

Usage notes

Another verb plain, to lament or complain, from French plaindre and Latin plangere, is now poetic and dialectal; it is related to complain.[7][4] A Middle English adjective plain “full, entire”, from Latin plēnus, was used until the late 17th century, as in plain battle.[7]

References

  1. ^ Jones, Daniel (2011), Cambridge English Pronouncing Dictionary, 18th ed., ed. Peter Roach, Jane Setter and John Esling, Cambridge: Cambridge University Press
  2. ^ a b c d e f g h i j k l m Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
  3. ^ a b c d e f g h i j k l m n o p Barnhart, Robert K. (1988), The Barnhart Dictionary of Etymology
  4. ^ a b Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
  5. ^ Hoad, T. F., ed. (1986), The Concise Oxford Dictionary of English Etymology, Oxford: Clarendon Press
  6. ^ a b Cresswell, Julia (2021), Oxford Dictionary of Word Origins, 3rd ed., Oxford: Oxford University Press
  7. ^ a b Shorter Oxford English Dictionary on Historical Principles (2002), 5th ed., ed. William R. Trumble and Angus Stevenson, Oxford: Oxford University Press