Etymology
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Words related to -let

-et 
word-forming element, originally a diminutive suffix but not now always felt as one, Middle English, from Old French -et (fem. -ete; Modern French -et, -ette), from Vulgar Latin *-ittum/*-itta (source also of Spanish -eto/-eta, Italian -etto/-etta), of unknown origin. The French forms are reduced to -et in English, but later borrowings of French words in -ette tend to keep that ending.
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-el (2)
diminutive suffix (though in Modern English not always perceived as such), from Old French -el (fem. -elle, Modern French -el, -eau), from Latin -ellus, -ella, -ellum, diminutive suffix, from PIE *-olo-lo-, itself a double diminutive, from *-lo- (see -ule).
anklet (n.)
"ornamental ring for an ankle," 1810, from ankle, with diminutive suffix -let, after bracelet, etc.
applet (n.)
by 1995, a diminutive formation from application + -let.
armlet (n.)
1530s, "metal band or ring worn around the upper arm," diminutive of arm (n.1) with -let. Compare bracelet. The Latin word was armilla. As "a small intrusion of the sea into the land," also 1530s.
billet (n.2)
"small paper, short document, note," mid-15c., earlier "an official register, roll, or record" (late 13c.), from Anglo-French billette "list, schedule," diminutive of bille "written statement" (see bill (n.1)) with -let.
billet (v.)
1590s, "to assign quarters to, to direct (a soldier) by note to a lodging place," from a noun meaning "a ticket given by a military officer directing a person to whom it is addressed to provide board and lodging for the soldier carrying it" (1640s). This was a specific use of the word, which earlier meant merely "official record or register" (late 13c.), from Anglo-French billette "list, schedule," diminutive of bille "written statement" (see bill (n.1)) with -let. From 1830 in the sense "place where a soldier is lodged." Related: Billeted; billeting.
booklet (n.)
"a small book," 1859, from book (n.) + diminutive ending -let.
boomlet (n.)
"small burst of activity, prosperity, etc.," 1880, from boom (n.3) + -let.
bulletin (n.)

1765, "authenticated official report concerning some event, issued for the information of the public," from French bulletin (16c.), modeled on Italian bulletino, diminutive of bulletta "document, voting slip," itself a diminutive of Latin bulla "round object" (see bull (n.2)) with equivalent of Old French -elet (see -let). For use of balls in voting, see ballot (n.).

The word was used earlier in English in the Italian form (mid-17c.). Popularized by their use in the Napoleonic Wars as the name for dispatches sent from the front and meant for the home public (which led to the proverbial expression as false as a bulletin). Broadcast news sense of "any brief, notice or public announcement of news" is from 1925. Bulletin board "public board on which news and notices are posted" is from 1831; computer sense is from 1979.