orbital

Etymology

It was first borrowed from Middle French orbital (“of the orbit of the eye”), from orbite (the source of orbit) and the suffix -al; the French adjective is recorded in 1533 in os orbital, in the passage that the first English quotation translates.^[2] Later uses come either from medieval or scientific Medieval Latin orbitālis or were formed afresh from English orbit + -al.^[2][3][4][5] The Latin adjective is recorded from about 1325 in a British source, meaning "cyclic".^[2] The noun orbit goes back to Latin orbita (“wheel track, path of a celestial body”), from orbis (“circle, orb”).^[2]

Earliest recorded meaning

Of or near the orbit of the eye, the eye socket: about 1541, in R. Copland's translation of Guy de Chauliac's surgery.^[2] Etymonline dates it to the 1540s,^[3] and the Shorter Oxford to the mid 16th century.^[4]

Semantic evolution

The word followed the senses of orbit: after the eye socket it was used of the path of a heavenly body, from 1839 in Etymonline^[3] and 1846 in the OED.^[2] In 1932 R. S. Mulliken used orbital as a noun for the pattern of electron density around an atomic nucleus.^[2][6] From 1933 British English used it of a road or railway encircling a large town, a sense that became a noun (an orbital) by 1970.^[2][7]

Timeline

• 1541 – of the orbit of the eye.^[2][3]
• 1839 – of the orbit of a heavenly body.^[3]
• 1846 – of or moving in an orbit (OED).^[2]
• 1932 – noun, an electron orbital.^[2][6]
• 1933 – British, of a road or railway encircling a town.^[2]
• 1970 – noun, an orbital road or railway.^[2]

Meanings

Adjective

1. Of, relating to, or moving in an orbit, especially that of a planet or satellite: the orbital period of a moon.^[7][6][2]
2. (anatomy) Of or near the eye socket.^[6][2]
3. (British) Of a motorway or other road, or a railway: circling a large city.^[7][2]

Noun

1. (physics, chemistry) The region around an atomic nucleus where an electron is likely to be found, described by a wave function.^[7][6][2]
2. (British) An orbital road or railway.^[7][2]

Word family

• anteorbital
• preorbital
• postorbital
• superorbital
• supraorbital
• suborbital
• interorbital
• transorbital

Related words

• orbit
• orb

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 q r Oxford English Dictionary Online (accessed March 2026), Oxford: Oxford University Press
3. ^ a b c d e Harper, Douglas. Online Etymology Dictionary, https://www.etymonline.com
4. ^ a b Shorter Oxford English Dictionary on Historical Principles (2002), 5th ed., ed. William R. Trumble and Angus Stevenson, Oxford: Oxford University Press
5. ^ Stevenson, Angus, ed. (2010), Oxford Dictionary of English, 3rd ed., Oxford: Oxford University Press
6. ^ a b c d e Merriam-Webster Unabridged Dictionary (2024), online ed., Springfield, Mass.: Merriam-Webster
7. ^ a b c d e Collins English Dictionary (2023), Glasgow: HarperCollins