Etymology
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subscription (n.)

c. 1400, subscripcioun, "piece of writing at the end of a document," from Anglo-French subscripcion, Old French subscription (Modern French souscription) and directly from Latin subscriptionem (nominative subscriptio) "anything written underneath, a signature," noun of action from past-participle stem of subscribere (see subscribe). Meaning "act of subscribing money" is from 1640s.

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scrip (n.)

1610s, "small piece of paper with writing on it, a written slip," apparently a corruption of script (n.). In the commercial use, "a certificate of a right to receive something" (especially a stock share), 1762, in this sense probably shortened from (sub)scrip(tion) receipt (see subscription). Originally "receipt for a portion of a loan subscribed;" the meaning "certificate issued as currency" is recorded by 1790. In U.S. history, "fractional paper money" (by 1889).

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sincerely (adv.)
1530s, "correctly;" 1550s, "honestly," from sincere + -ly (2). As a subscription to letters, recorded from 1702.
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flu (n.)
1839, flue, shortening of influenza. Spelling flu attested from 1893. The abstraction of the middle syllable is an uncommon method of shortening words in English; Weekley compares tec for detective, scrip for subscription.
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yours (pron.)

absolutive form of your, c. 1300, on model of his, ours, etc. Yours truly "myself" is from 1833, from the common subscription of letters.

It is difficult to say what will succeed, and still more to pronounce what will not. I am at this moment in that uncertainty (on our own score,) and it is no small proof of the author's powers to be able to charm and fix a mind's attention on similar subjects and climates in such a predicament. That he may have the same effect upon all his readers is very sincerely the wish, and hardly the doubt, of yours truly,
"B."
[Lord Byron to John Murray, Dec. 4, 1813]
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assembly (n.)

c. 1300, "a gathering of persons, a group gathered for some purpose," from Old French as(s)emblee "assembly, gathering; union, marriage," noun use of fem. past participle of assembler "to assemble" (see assemble). Meaning "a gathering together" is recorded from early 15c.; that of "act of assembling parts or objects" is from 1914, as is assembly line.

Perhaps the most interesting department in the whole factory, to the visitor, is the final assembly. In this division, all the assembled units meet the assembly conveyor at the point where they are needed. At the start of the track a front axle unit, a rear axle unit and a frame unit are assembled. This assembly is then started in motion by means of a chain conveyor, and as it moves down the room at a constant speed of eight feet per minute, each man adds one part to the growing chassis or does one operation, which is assigned to him, so that when the chassis reaches the end of the line, it is ready to run on its own power. ["The Story of an Automobile Factory," in "Universal Book of Knowledge and Wonders," 1917]

School sense, "gathering of all students for a presentation" is from 1932. From mid-14c. as "a gathering for deliberation," hence it is the name of the lower house in state (earlier colonial) legislatures in America (1680s). In 17c.-18c. assemblies "dancing balls 'among polite persons of both sexes,' often paid for by subscription of the participants" were a prominent feature of social life.

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