Etymology
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departure (n.)

mid-15c., "act of going away," also "deviation, divergence, a turning away," from Old French departeure "departure," figuratively, "death, act or fact of leaving the present life," from departir (see depart) + -ure (see -ure).

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decession (n.)

c. 1400, decessioun, "departure, separation;" c. 1600, "decrease from a standard, diminution," from Latin decessionem(nominative decessio) "a going away, departure," noun of action from past-participle stem of decedere "to go down, depart," from de "away" (see de-) + cedere "to go" (from PIE root *ked- "to go, yield").

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deviance (n.)

1944, "departure from a standard in behavior or state;" see deviant + -ance. A sociologists' word, perhaps coined because statisticians and astronomers already had claimed deviation.

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hegira (n.)
flight of Muhammad from Mecca to Medina (July 16, 622 C.E.), the event from which the Islamic calendar reckons, 1580s, from Medieval Latin hegira, from Arabic hijrah "departure," from hajara "to depart."
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Exodus 

late Old English, the second book of the Old Testament, from Latin exodus, from Greek exodos "a military expedition; a solemn procession; departure; death," literally "a going out," from ex "out" (see ex-) + hodos "a way, path, road; a ride, journey, march," figuratively "way out, means," a word of uncertain origin. The book is so called because it tells of the departure of the Israelites from Egypt under the leadership of Moses. General sense (with lower-case -e-) "departure from a place," especially "the migration of large bodies of people or animals from one country or region to another," is from 1620s.

Beekes derives the Greek word from PIE *sod- "course" and says it is traditionally connected with Slavic words for "course" (such as Russian xod "course, progress," "which might have been borrowed from Iranian") and adds that it is perhaps also related to Sanskrit a-sad- "to tread on, go on," Avestan apa-had- "to go away; become weak," "but the relation between them is unclear, as is the connection to the PIE root *sed- "sit" (proposed in Watkins, etc.)."

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elopement (n.)

"a running away, an escape, private or unlicensed departure from the place or station to which one is bound by duty or law," especially "the running away of a woman, married or unmarried, with a lover," 1540s, from elope + -ment. (The word was in Anglo-French in 14c. as alopement).

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obituary (n.)
Origin and meaning of obituary

1706, "register of deaths, a list of the dead," from Medieval Latin obituarius "a record of the death of a person," literally "pertaining to death," from Latin obitus "departure, a going to meet, encounter" (a euphemism for "death"), from stem of obire "go toward, go to meet" (as in mortem obire "meet death"), from ob "toward" (see ob-) + ire "to go" (from PIE root *ei- "to go").

Meaning "a record or announcement of a death," especially in a newspaper, and including a brief biographical sketch, is from 1738. As an adjective, "relating to or recording a death," from 1828. A similar euphemism is in Old English cognate forðfaran "to die," literally "to go forth;" utsið "death," literally "going out, departure."

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divergence (n.)

"act or state of moving or pointing in opposite directions," 1650s, from Modern Latin divergentia, from divergens, present participle of divergere "go in different directions," from assimilated form of dis- "apart" (see dis-) + vergere "to bend, turn, tend toward" (from PIE root *wer- (2) "to turn, bend"). Figurative sense of "departure from a course or standard" is from 19c.  Related: Divergency.

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exit (n.)

1530s (late 15c. as a Latin word in English), originally a stage direction, from Latin exit "he or she goes out," third person singular present indicative of exire "go out, go forth, depart," from ex- "out" (see ex-) + ire "to go" (from PIE root *ei- "to go"). Also from Latin exitus "a leaving, a going out," noun of action from exire.

Meaning "a departure" (originally from the stage) is from 1580s. Meaning "a way of departure" is from 1690s; specific meaning "door for leaving" is from 1786. The verb is c. 1600, from the noun; it ought to be left to stage directions and the clunky jargon of police reports. Related: Exited; exiting.

Those who neither know Latin nor read plays are apt to forget or not know that this is a singular verb with plural exeunt. [Fowler]

Exit poll attested by 1980.

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decease (n.)
Origin and meaning of decease

"death," early 14c., from Old French deces (12c., Modern French décès) "decease, death," from Latin decessus "death" (euphemism for mors), also "a retirement, a departure," from decess-, past participle stem of decedere "die, depart, withdraw," literally "to go down," from de "away" (see de-) + cedere "to go" (from PIE root *ked- "to go, yield"). Still used with a tinge of euphemism.

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