Etymology
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Words related to index

*en 
Proto-Indo-European root meaning "in."

It forms all or part of: and; atoll; dysentery; embargo; embarrass; embryo; empire; employ; en- (1) "in; into;" en- (2) "near, at, in, on, within;" enclave; endo-; enema; engine; enoptomancy; enter; enteric; enteritis; entero-; entice; ento-; entrails; envoy; envy; episode; esoteric; imbroglio; immolate; immure; impede; impend; impetus; important; impostor; impresario; impromptu; in; in- (2) "into, in, on, upon;" inchoate; incite; increase; inculcate; incumbent; industry; indigence; inflict; ingenuous; ingest; inly; inmost; inn; innate; inner; innuendo; inoculate; insignia; instant; intaglio; inter-; interim; interior; intern; internal; intestine; intimate (adj.) "closely acquainted, very familiar;" intra-; intricate; intrinsic; intro-; introduce; introduction; introit; introspect; invert; mesentery.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit antara- "interior;" Greek en "in," eis "into," endon "within;" Latin in "in, into," intro "inward," intra "inside, within;" Old Irish in, Welsh yn, Old Church Slavonic on-, Old English in "in, into," inne "within, inside."
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*deik- 
Proto-Indo-European root meaning "to show," also "pronounce solemnly," "also in derivatives referring to the directing of words or objects" [Watkins].

It forms all or part of: abdicate; abdication; addict; adjudge; apodictic; avenge; benediction; betoken; condition; contradict; contradiction; dedicate; deictic; deixis; dictate; diction; dictionary; dictum; digit; disk; ditto; ditty; edict; Eurydice; index; indicate; indication; indict; indiction; indictive; indite; interdict; judge; judicial; juridical; jurisdiction; malediction; malison; paradigm; policy (n.2) "written insurance agreement;" preach; predicament; predicate; predict; prejudice; revenge; soi-disant; syndic; teach; tetchy; theodicy; toe; token; valediction; vendetta; verdict; veridical; vindicate; vindication; voir dire.

It is the hypothetical source of/evidence for its existence is provided by: Sanskrit dic- "point out, show;" Greek deiknynai "to show, to prove," dike "custom, usage;" Latin dicere "speak, tell, say," digitus "finger," Old High German zeigon, German zeigen "to show," Old English teon "to accuse," tæcan "to teach."
diction (n.)

1540s, "a word," a sense now obsolete, from Late Latin dictionem (nominative dictio) "a saying, expression; a word; kind of delivery, style," noun of action from past-participle stem of Latin dicere "to say, state, proclaim, make known, allege, declare positively" (source of French dire "to say"), which is related to dicare "to talk, speak, utter, make speech; pronounce, articulate," both from PIE root *deik- "to show," also "pronounce solemnly." The meaning "manner of saying," especially in reference to the choice of words, is from 1700.

Latin dicere and dicare are presumed to have been originally the same word. De Vann writes that "the verb dicāre may well have been backformed from compounds in -dicāre." The basic sense in both is "to talk, speak, declare." They seem to have divided, imperfectly, the secondary senses between them: dicere "to say, state, proclaim, make known, allege, declare positively; plead (a case);" in religion, "to dedicate, consecrate," hence, transferred from the religion sense, "give up, set apart, appropriate;" dicare "to talk, speak, utter, make speech; pronounce, articulate; to mean, intend; describe; to call, to name; appoint, set apart."

indices (n.)
according to OED, the plural form of index preferable in scientific and mathematical senses of that word.
indicia (n.)
"indications, discriminating marks," Latin plural of indicium "a notice, information, disclosure, discovery," from index (genitive indicis); see index (n.).
indexation (n.)
1960, in reference to rates of wages, prices, etc. pegged to a specified index of economic activity, noun of action from index (v.).