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essence [essence 词源字典]: essence: [14] Essence and its derivative essential [14] are the English descendants of the Latin verb ‘to be’, esse (which came ultimately from the Indo-European base *es- ‘be’, source also of English is). From it was formed the abstract noun essentia ‘being, existence’, acquired by English through Old French essence. In the adjective essential, the sense ‘absolutely necessary’ developed via ‘inherent’ and ‘indispensable’ in the 16th century.
=> is[essence etymology, essence origin, 英语词源]
quintessence: quintessence: [15] Just as modern particle physicists search for the ultimate constituent of matter, the common denominator of all known forces, so medieval alchemists tried to find a fifth primary essence, which together with earth, air, fire, and water formed the substance of all heaven and earth. This fifth essence, higher and more ethereal than the other four, was postulated by Aristotle, who called it aithēr ‘either’.

Another Greek term for it was pemptē ousíā ‘fifth essence’, which was translated into medieval Latin as quinta essentia – whence, via French, English quintessence. The metaphorical sense ‘most perfect or characteristic embodiment’ began to emerge in the second half of the 16th century. Other English words based on quintus ‘fifth’, the ordinal form of Latin quinque ‘five’, include quintet [19] and quintuple [16].
absence (n.): late 14c., from Old French absence (14c.), from Latin absentia, noun of state from absentem (nominative absens), present participle of abesse "be away from, be absent," from ab- "away" (see ab-) + esse "to be" (see essence).
Absence makes the heart grow fonder
[Thomas Haynes Bayly (1797-1839) "Isle of Beauty"]
essence (n.): late 14c., essencia (respelled late 15c. on French model), from Latin essentia "being, essence," abstract noun formed (to translate Greek ousia "being, essence") from essent-, present participle stem of esse "to be," from PIE *es- "to be" (cognates: Sanskrit asmi, Hittite eimi, Old Church Slavonic jesmi, Lithuanian esmi, Gothic imi, Old English eom "I am;" see be).

Originally "substance of the Trinity;" the general sense of "basic element of anything" is first recorded in English 1650s, though this is the underlying notion of the first English use of essential. Meaning "ingredient which gives something its particular character" is from c. 1600, especially of distilled oils from plants (1650s), hence "fragrance, perfume" (17c.). In 19c. U.S., essence-peddler could mean "medical salesman" and "skunk."
omnipresence (n.): c. 1600, from Medieval Latin omnipraesentia, from omnipraesens, from Latin omnis "all, every" (see omni-) + praesens "present" (see present (adj.)).
presence (n.): mid-14c., "fact of being present," from Old French presence (12c., Modern French présence), from Latin praesentia "a being present," from praesentem (see present (n.)). Meaning "carriage, demeanor, aspect" (especially if impressive) is from 1570s; that of "divine, spiritual, or incorporeal being felt as present" is from 1660s. Presence of mind (1660s) is a loan-translation of French présence d'esprit, Latin praesentia animi.
quintessence (n.): early 15c., in ancient and medieval philosophy, "pure essence, substance of which the heavenly bodies are composed," literally "fifth essence," from Middle French quinte essence (14c.), from Medieval Latin quinta essentia, from Latin quinta, fem. of quintus "fifth" (see quinque-) + essentia (see Parousia).

A loan-translation of Greek pempte ousia, the "ether" added by Aristotle to the four known elements (water, earth, fire, air) and said to permeate all things. Its extraction was one of the chief goals of alchemy. Sense of "purest essence" (of a situation, character, etc.) is first recorded 1580s.
mesencephalon: "Another term for midbrain", Mid 19th century: from Greek mesos 'middle' + encephalon.