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agoraphobia [agoraphobia 词源字典]: agoraphobia: [19] Agoraphobia – fear of open spaces or, more generally, of simply being out of doors – is first referred to in an 1873 issue of the Journal of Mental Science; this attributes the term to Dr C Westphal, and gives his definition of it as ‘the fear of squares or open places’. This would be literally true, since the first element in the word represents Greek agorá ‘open space, typically a market place, used for public assemblies’ (the most celebrated in the ancient world was the Agora in Athens, rivalled only by the Forum in Rome).

The word agorá came from ageirein ‘assemble’, which is related to Latin grex ‘flock’, the source of English gregarious. Agoraphobia was not the first of the -phobias. That honour goes to hydrophobia in the mid 16th century. But that was an isolated example, and the surge of compounds based on Greek phóbos ‘fear’ really starts in the 19th century.

At first it was used for symptoms of physical illness (photophobia ‘abnormal sensitivity to light’ 1799), for aversions to other nationalities (Gallophobia 1803; the synonymous Francophobia does not appear until 1887), and for facetious formations (dustophobia, Robert Southey, 1824), and the range of specialized psychological terms familiar today does not begin to appear until the last quarter of the century (CLAUSTROPHOBIA 1879, acrophobia ‘fear of heights’ from Greek akros ‘topmost’ – see ACROBAT – 1892).
=> aggregate, allegory, gregarious, segregate[agoraphobia etymology, agoraphobia origin, 英语词源]
always: always: [13] In Old English, the expression was alne weg, literally ‘all the way’. It seems likely that this was used originally in the physical sense of ‘covering the complete distance’, but by the time it starts to appear in texts (King Alfred’s is the first recorded use, in his translation of Boethius’s De consolatione philosophiae around 888) it already meant ‘perpetually’. Alway survived into modern English, albeit as an archaism, but began to be replaced as the main form by always in the 12th century.

The final -s is genitive, not plural, and was originally added to all as well as way: alles weis. It has a generalizing force, much as in modern English one might say of a morning for ‘every morning’.
=> way
break (n.): c. 1300, "act of breaking," from break (v.). Sense of "short interval between spells of work" (originally between lessons at school) is from 1861. Meaning "stroke of luck" is attested by 1911, probably an image from billiards (where the break that starts the game is attested from 1865). Meaning "stroke of mercy" is from 1914. Musical sense, "improvised passage, solo" is attested from 1920s in jazz.
fit (n.2): "paroxysm, sudden attack" (as of anger), 1540s, probably via Middle English sense of "painful, exciting experience" (early 14c.), from Old English fitt "conflict, struggle," which is of uncertain origin, with no clear cognates outside English. Perhaps ultimately cognate with fit (adj.) on notion of "to meet." Meaning "sudden impulse toward activity or effort" is from 1580s. Phrase by fits and starts first attested 1610s (by fits is from 1580s).
fugue (n.): type of musical composition, 1590s, fuge, from Italian fuga, literally "flight," also "ardor," from Latin fuga "a running away, act of fleeing," from fugere "to flee" (see fugitive (adj.)). Current English spelling (1660s) is from the French version of the Italian word.
A Fugue is a composition founded upon one subject, announced at first in one part alone, and subsequently imitated by all the other parts in turn, according to certain general principles to be hereafter explained. The name is derived from the Latin word fuga, a flight, from the idea that one part starts on its course alone, and that those which enter later are pursuing it. ["Fugue," Ebenezer Prout, 1891]
induction (n.): late 14c., "advancement toward the grace of God;" also (c. 1400) "formal installation of a clergyman," from Old French induction (14c.) or directly from Latin inductionem (nominative inductio) "a leading in, introduction," noun of action from past participle stem of inducere "to lead" (see induce).

As a term in logic (early 15c.) it is from Cicero's use of inductio to translate Greek epagoge "leading to" in Aristotle. Induction starts with known instances and arrives at generalizations; deduction starts from the general principle and arrives at some individual fact. As a term of science, c. 1800; military service sense is from 1934, American English.
jackpot (n.): also jack-pot, "big prize," 1944, from slot machine sense (1932), from obsolete poker sense (1881) of antes that begin when no player has a pair of jacks or better; from jack (n.) in the card-playing sense + pot (n.1). Earlier, in criminal slang, it meant "trouble," especially "an arrest" (1902).
The regular Draw-Poker game is usually varied by occasional Jack-Pots, which are played once in so many deals, or when all have refused to play, or when the player deals who holds the buck, a marker placed in the pool with every jack-pot. In a jack-pot each player puts up an equal stake and receives a hand. The pot must then be opened by a player holding a hand of the value of a pair of knaves (jacks) or better. If no player holds so valuable a hand the deal passes and each player adds a small sum to the pot or pool. When the pot is opened the opener does so by putting up any sum he chooses, within the limit, and his companions must pay in the same amount or "drop." They also possess the right to raise the opener. The new cards called for are then dealt and the opener starts the betting, the play proceeding as in the regular game. ["Encyclopaedia Britannica," 11th ed., 1911, "Poker." The article notes "Jack-Pots were introduced about 1870."]
starter (n.): c. 1400, stertour "instigator; one who starts," agent noun from start (v.). Mechanical sense is from 1875. For starters "to begin with" is 1873, American English colloquial. Starter home is from 1976; starter set is from 1946, originally of china.
tautochrone: "A curve upon which a body moving under gravity or another force will reach the lowest point (or some other fixed point) in the same amount of time, regardless of the point from which it starts", Late 18th cent.; earliest use found in Oliver Goldsmith (?1728–1774), author. From French tautochrone from post-classical Latin tautochronus, adjective from tauto- + ancient Greek χρόνος time.