Etymology
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April 

fourth month, c. 1300, aueril, from Old French avril (11c.), from Latin (mensis) Aprilis, second month of the ancient Roman calendar, from a stem of uncertain origin and meaning, with month-name suffix -ilis as in Quintilis, Sextilis (the old names of July and August).

Perhaps based on Apru, an Etruscan borrowing of Greek Aphrodite. Or perhaps *ap(e)rilis "the following, the next," from its place as the second month of the old Roman calendar, from Proto-Italic *ap(e)ro-, from PIE *apo- "away, off" (see apo-; compare Sanskrit aparah "second," Gothic afar "after"). Old folk etymology connected it with Latin aperire "to open."

The name was in English in Latin form from mid-12c.; it replaced Old English Eastermonað, which was named for a fertility goddess (see Easter). It was re-spelled in Middle English on the Latin model (as apprile, a form first attested late 14c.).

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April fool (n.)

1680s; see April + fool (n.). April-gowk (from Old Norse gaukr "a cuckoo") is a northern variant. April Fool's Day customs of sending people on false errands seem to have come to England from France late 17c.; originally All Fool's Day (1712). In Cumberland, Westmorland and northern parts of Lancashire and Yorkshire, however, May 1 was the day for hoaxing, and the fool was a May gosling. That custom is attested by 1791.

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titanic (adj.)

"gigantic, colossal," 1709, from titan + -ic. The British passenger liner R.M.S. Titanic sank April 15, 1912, and the name became symbolic of the destruction of supposedly indestructible.

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Earth Day 

as an annual ecological awareness event on April 22, from 1970; the idea for it and the name date from 1969.

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telethon (n.)

prolonged TV fundraiser, 1949, from television + marathon (see -athon). Milton Berle's 16-hour television cancer fundraiser in April 1949 might have been the first to be so called.

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Ceres 

Roman goddess of agriculture (identified with Greek Demeter), also the name given to the first-found and largest asteroid (discovered 1801 by Piazzi at Palermo), from PIE *ker-es-, from root *ker- (2) "to grow." Her festival, Cerealia, was April 10.

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Bolo (n.)

"traitor," 1917, from Paul Bolo, French adventurer shot for treason April 17, 1918; used in World War I with reference to pacifist propagandists; later somewhat assimilated to Bolshevik (q.v.).

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nelson (n.)

type of wrestling hold, 1875, apparently from a proper or surname, but no one now knows whose.

Presently, Stubbs, the more skilful as well as the more powerful of the twain, seizes the luckless Jumper in a terrible gripe, known to the initiated as the Full Nelson. ["Lancashire Recreations," in Chambers's Journal, April 24, 1875]
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Shiloh 

village on the west bank of the Jordan River, perhaps from an alteration of Hebrew shalo "to be peaceful." The American Civil War battle fought in western Tennessee (April 6-7, 1862) was so called for being fought around the little Shiloh log church (Methodist), which was destroyed in the battle.

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queueing (n.)

"act or fact of standing in line," 1918, verbal noun from queue (v.).

"Queueing" had really become an equivalent for sport with some working-class women. It afforded an occasion and an opportunity for gossip. ["The War of Food in Britain," in The Congregationalist and Advance, April 25, 1918]
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