Etymology
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title (n.)

c. 1300, "inscription, heading," from Old French title "title or chapter of a book; position; legal permit" (12c., Modern French titre, by dissimilation), and in part from Old English titul, both from Latin titulus "inscription, label, ticket, placard, heading; honorable appellation, title of honor," of unknown origin. Meaning "name of a book, play, etc." first recorded mid-14c. The sense of "name showing a person's rank" in English is first attested 1580s. Sports championship sense attested from 1913 (originally in lawn tennis), hence titlist (1913). A title role in theater is one which gives its name to the play.

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title (v.)
"to furnish with a title," early 14c., from title (n.). Related: Titled; titling.
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titrate (v.)
1854, with -ate (2) + French titrer, from titre "standard, title," also "fineness of alloyed gold" (see title (n.)).
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untitled (adj.)
1610s, "unnamed," from un- (1) "not" + past participle of title (v.). Meaning "having no right" is from 1660s; that of "undistinguished by an aristocratic title" is from 1798.
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titular (adj.)

1590s, from or based on French titulaire (16c.), from Latin titulus (see title) + -ar. Related: Titulary.

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subtitle (n.)
also sub-title, 1825, "subordinate or additional title, usually explanatory," in reference to literary works, from sub- "under" + title (n.). Applied to motion pictures by 1908. As a verb from 1858. Related: Subtitled.
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tilde (n.)
1864, from Spanish, metathesis of Catalan title, from vernacular form of Medieval Latin titulus "stroke over an abridged word to indicate missing letters," a specialized sense of Latin titulus, literally "inscription, heading" (see title (n.)). The mark itself represents an -n- and was used in Medieval Latin manuscripts in an abridged word over a preceding letter to indicate a missing -n- and save space.
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entitle (v.)
also intitle, late 14c., "to give a title to a chapter, book, etc.," from Anglo-French entitler, Old French entiteler "entitle, call" (Modern French intituler), from Late Latin intitulare "give a title or name to," from in- "in" (from PIE root *en "in") + titulus "title" (see title (n.)).

Meaning "to bestow (on a person) a rank or office" is mid-15c. Sense of "to give (someone) 'title' to an estate or property," hence to give that person a claim to possession or privilege, is mid-15c.; this now is used mostly in reference to circumstances and actions. Related: Entitled; entitling.
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tittle (n.)

"small stroke or point in writing," late 14c. (Wyclif, in Matthew v.18), translating Latin apex in Late Latin sense of "accent mark over a vowel," which itself translates Greek keraia (literally "a little horn"), used by the Greek grammarians of the accents and diacritical points, in this case a Biblical translation of Hebrew qots, literally "thorn, prick," used of the little lines and projections by which the Hebrew letters of similar form differ from one another.

Wyclif's word is borrowed from a specialized sense of Latin titulus (see title (n.)), which was used in Medieval Latin (and in Middle English and Old French) to indicate "a stroke over an abridged word to indicate letters missing" (and compare Provençal titule "the dot over -i-").

As apex was used by the Latin grammarians for the accent or mark over a long vowel, titulus and apex became to some extent synonymous; hence Wyclif's use of titil, titel to render L. apex [OED]

Compare tilde, which is the Spanish form of the same word.

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mondo (adj.)

"very much, extreme," 1979, from Italian mondo "world" (from Latin mundus; see mundane); specifically from "Mondo cane," title of a 1961 film, literally "world for a dog" (English title "A Dog's Life"), depicting eccentric human behavior. The word was abstracted from the title and taken as an intensifier.

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