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Definition of index : 1. A prologue indicating what follows.
2. A table for facilitating reference to topics, names, and the like, in a book; - usually alphabetical in arrangement, and printed at the end of the volume.
3. That which guides, points out, informs, or directs; a pointer or a hand that directs to anything, as the hand of a watch, a movable finger on a gauge, scale, or other graduated instrument. In printing, a sign used to direct particular attention to a note or paragraph; -- called also fist.
4. That which points out; that which shows, indicates, manifests, or discloses.
5. The figure or letter which shows the power or root of a quantity; the exponent.
6. The ratio, or formula expressing the ratio, of one dimension of a thing to another dimension; as, the vertical index of the cranium.
7. The second digit, that next pollex, in the manus, or hand; the forefinger; index finger.
8. To provide with an index or table of references; to put into an index; as, to index a book, or its contents.

Synonyms:

acknowledgments, common factor, business leader, pension off, great power, directory, indicator, rating, appendix, index finger, office, par, contents, show, quality assurance, symptom, pensioner, body, forefinger, constant, artwork, arithmetic progression, powerfulness, mark, hand, signification, gauge, baseline, witness, top executive, world power, ratio, common multiple, contributory, proponent, indicant, might, sign, rule, back, base, superpower, blurb, mogul, indication, force, advocator, reference, stamp, king, major power, index number, afterword, level, criterion, pension, bibliography, occupational pension, quality, manifestation, addendum, token, tycoon, standard, Arabic numeral, pension fund, the AARP, waitlist, guide, magnate, badge, needle, mightiness, contribution, ability, baron, pointer, computation, sign in, average, binding, symbol, evidence, big businessman, sign up, advocate, IRA

libretto, report, treatise, textbook, volume, leaflet, folio, play book, tract, booklet, verse, manual, publication, magazine, chapter, script, handbook, tome, pamphlet, insert, monograph, work, compendium, brochure, serial

lexicon, audit, budget, recording, annual, check, detail, recount, summarize, summary, manifest, schedule, repertory, scroll, score, documentation, count, logbook, bill, thesaurus, total, treasury, document, collection, sum, file, cash book, annals, itemize, storybook, menu, roll, workbook, waybill, table, store, pad, census, roster, tally, tablet, invoice, dictionary, blank-book, digest, tabulate, collect, itemization, list, novel, registry

fraction, algorithm, integral, differential calculus, dividend, reciprocal, numerator, multiplicand, root, algebra, trigonometry, arithmetic, denominator, radix, coefficient, square root, cube, logarithm, quadratics, antilogarithm, minuend, calculus, multiplier, divisor, subtrahend, formula, geometry, exponent, quotient, factor, multiplicator, cube root, modulus, power, multiple, increment

description, recital, docket, book, enumeration, scrapbook, memorandum, statement, minute, record, journal, daybook, newspaper, cashbook, bank-book, catalog, register, ledger, memo, narrative, newsletter, enumerate, autobiography, history, diary, chronology, notebook, anecdote, account, album, inventory, archive, note, clock, journalize, log, chronicle, epic, biography, yearbook, calendar

Usage examples:

• We have seen that by varying the conditions of the experiment different kinds of waves may be produced in a bucket of water; and as a study of these waves might furnish an index to the conditions which produced them, so the study of the waves peculiar to the light which comes from any source may be made to give information about the molecules which make up that source. - "A Text-Book of Astronomy", George C. Comstock.
• He has that beauty which women love to look on: the bold bright eye, the open forehead, the frank, easy smile, and his face is only a faithful index to his heart; he is as frank as brave, and yet as tender- hearted as he looks to be; he is specially formed to love and to be loved." - "La Vendée An Historical Romance", Anthony Trollope.
• The wide gap that existed a few years ago between the index price of agricultural products and the index price of other products has been gradually closing up, though the recent depression in cotton has somewhat enlarged it. - "State of the Union Addresses of Calvin Coolidge", Calvin Coolidge.