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jubilee: jubilee: [14] Despite their similarity, jubilee has no etymological connection with jubilation [14] and jubilant [17]; but they have exerted a considerable influence on it over the centuries. It was originally a Hebrew word: Hebrew yōbhēl meant ‘leading animal, ram’, and by extension ‘ram’s horn’, and since a ram’s horn was blown to announce the start of a special year (set aside once every fifty years according to ancient Hebrew law) in which slaves were freed, land left untilled, etc, the term yōbēl came to be used for the year itself.

Greek took it over as ióbēlos and formed an adjective from it, iōbēlaios. This was passed on to Latin, and it was here that jubilation took a hand. Latin jūbilāre (source of English jubilation) originally meant simply ‘call out’, but early Christian writers used it for ‘shout for joy’. Under its influence Greek iōbēlaios became Latin jūbilaeus, which was used in the expression annus jūbilaeus to denote this special Jewish year.

It soon came to be used as a noun in its own right, and in this role passed via Old French jubile into English. By this time the ideas of ‘fifty years’ and ‘joy, celebration’ had mingled to such an extent that the word was being used for a ‘fiftieth anniversary’ or its celebration, a sense which remained current until the early 20th century (in present-day English it means simply ‘anniversary’, usually of a monarch’s accession, and the period involved has to be defined by golden, silver, etc).
auspices (n.): plural (and now the usual form) of auspice; 1530s, "observation of birds for the purpose of taking omens," from French auspice (14c.), from Latin auspicum "divination from the flight of birds; function of an auspex" (q.v.). Meaning "any indication of the future (especially favorable)" is from 1650s; earlier (1630s) in extended sense of "benevolent influence of greater power, influence exerted on behalf of someone or something," originally in expression under the auspices of.
biographer (n.): 1715; see biography + -er (1). Earlier was biographist (1660s).
Of every great and eminent character, part breaks forth into public view, and part lies hid in domestic privacy. Those qualities which have been exerted in any known and lasting performances may, at any distance of time, be traced and estimated; but silent excellencies are soon forgotten; and those minute peculiarities which discriminate every man from all others, if the are not recorded by those whom personal knowledge enabled to observe them, are irrecoverably lost. [Johnson, "Life of Sir Thomas Browne," 1756]
exert (v.): 1660s, "thrust forth, push out," from Latin exertus/exsertus, past participle of exerere/exserere "thrust out, put forth," from ex- "out" (see ex-) + serere "attach, join" (see series). Meaning "put into use" is 1680s. Related: Exerted; exerting.
force (n.): c. 1300, "physical strength," from Old French force "force, strength; courage, fortitude; violence, power, compulsion" (12c.), from Vulgar Latin *fortia (source also of Old Spanish forzo, Spanish fuerza, Italian forza), noun use of neuter plural of Latin fortis "strong, mighty; firm, steadfast; brave, bold" (see fort).

Meanings "power to convince the mind" and "power exerted against will or consent" are from mid-14c. Meaning "body of armed men, a military organization" first recorded late 14c. (also in Old French). Physics sense is from 1660s; force field attested by 1920. Related: Forces.
Macbeth: masc. proper name, Gaelic, literally "son of life." The first reference to bad luck associated with Shakespeare's "Macbeth," and to avoidance of naming it, is from 1896, alludes to an incident of 1885, and says the tradition goes back "so far as modern memory can recall." The original superstition seems to have pertained particularly to the witches' scenes, which were played up dramatically in 19c. productions, and especially to Matthew Locke's 17c. music to accompany the witches' song, which was regularly played through the 19th century.
It is strange how the effect of this music has exerted such a long surviving influence on members of the dramatic profession. It is still considered most unlucky to sing, hum, or whistle the witch airs in the theatre except in the ways of business. [Young-Stewart, "The Three Witches," in "The Shakespearean," Sept. 15, 1896]

If you number an actor or actress among your friends, and desire to retain his or her friendship, there are three things you positively must not do, especially if the actor is of the old school. Do not whistle in the theatre, do not look over his shoulder into the glass while he is making up, and do not hum the witch's song from "Macbeth." ... [O]lder actors would almost prefer to lose their salary than go on in "Macbeth" on account of this song. They believe that it casts spells upon the members of the company. ["Some Odd Superstitions of the Stage," "Theatre" magazine, July 1909]
psychological (adj.): 1680s; see psychology + -ical. Related: Psychologically. Psychological warfare recorded from 1940. Psychological moment was in vogue from 1871, from French moment psychologique "moment of immediate expectation of something about to happen."
The original German phrase, misinterpreted by the French & imported together with its false sense into English, meant the psychic factor, the mental effect, the influence exerted by a state of mind, & not a point of time at all, das Moment in German corresponding to our momentum, not our moment. [Fowler]
hydrodynamics: "The branch of science concerned with forces acting on or exerted by fluids (especially liquids)", Late 18th century: from modern Latin hydrodynamica, from Greek hudro- 'water' + dunamikos (see dynamic).