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From Latinindex(“a discoverer, informer, spy; of things, an indicator, the forefinger, a title, superscription”), from indicō(“point out, show”); see indicate.
1731, John Arbuthnot, An Essay Concerning the Nature of Aliments, and the Choice of Them, According to the Different Constitutions of Human Bodies., 1st Irish edition, Dublin: S. Powell, for George Risk,, George Ewing,, and William Smith,, →OCLC:
Tastes are the Indexes of the different Qualities of Plants.
In other words, we predict that the index for a new pair of materials can be obtained from the indexes of the individual materials, both against air or against vacuum.
2019 November 21, Samanth Subramanian, “How our home delivery habit reshaped the world”, in The Guardian:
For thousands of years, human progress was indexed to the ease and speed of our mobility: our capacity to walk on two legs, and then to ride on animals, sail on boats, chug across the land and fly through the air, all to procure for ourselves the food and materials we wanted.
(automotive)turn signal(US), indicator(UK)(each of the flashing lights on each side of a vehicle which indicate a turn is being made to left or right, or a lane change)
index in Bárczi, Géza and László Országh. A magyar nyelv értelmező szótára (‘The Explanatory Dictionary of the Hungarian Language’, abbr.: ÉrtSz.). Budapest: Akadémiai Kiadó, 1959–1962. Fifth ed., 1992: →ISBN
Latin
Etymology
From in + the root of dīcere(“to indicate”) + -s. Compare iūdex.
“index”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
“index”, in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
index in Charles du Fresne du Cange’s Glossarium Mediæ et Infimæ Latinitatis (augmented edition with additions by D. P. Carpenterius, Adelungius and others, edited by Léopold Favre, 1883–1887)
index in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette.
Carl Meißner, Henry William Auden (1894) Latin Phrase-Book, London: Macmillan and Co.
the title of a book: index, inscriptiolibri
“index”, in Harry Thurston Peck, editor (1898), Harper's Dictionary of Classical Antiquities, New York: Harper & Brothers
“index”, in William Smith, editor (1848), A Dictionary of Greek and Roman Biography and Mythology, London: John Murray
“index”, in William Smith et al., editor (1890), A Dictionary of Greek and Roman Antiquities, London: William Wayte. G. E. Marindin