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bluestocking [bluestocking 词源字典]: bluestocking: [18] The term bluestocking ‘female intellectual’ derives from the gatherings held at the houses of fashionable mid-18th- century hostesses to discuss literary and related topics. It became the custom at these not to put on full formal dress, which for gentlemen included black silk stockings. One habitué in particular, Mr Benjamin Stillingfleet, used to wear greyish worsted stockings, conventionally called ‘blue’.

This lack of decorum was looked on with scorn in some quarters, and Admiral Boscawan dubbed the participants the ‘Blue Stocking Society’. Women who attended their highbrow meetings thus became known as ‘Blue Stocking Ladies’ (even though it was a man who had worn the stockings), and towards the end of the century this was abbreviated to simply bluestockings.
[bluestocking etymology, bluestocking origin, 英语词源]
topic: topic: [16] Greek tópos meant ‘place’. From it was derived the adjective topikós ‘of a place’, which came to mean ‘commonplace’. Aristotle used it in the title of his treatise Tà topiká, which contains commonplace arguments, and it was with direct reference to this that the word first arrived in English (via Latin topica). The sense ‘subject, theme’ arose in the 18th century from the notion of the various heads of argument contained in Tà topiká and works like it.

The derived topical [16] originally meant ‘of topics’; the specialization to ‘of topics of the day, of current interest’ is as recent as the second half of the 19th century. The word’s original notion of ‘place’ is preserved in topography [15] and topology [17]. The diminutive form of Greek tópos was tópion ‘small place’, hence ‘field’.

Latin took over its plural as topia, and used it for ‘ornamental gardening’. From it was derived the adjective topiārius, which forms the basis of English topiary [16].
=> topiary, topography
commencement (n.): late 13c., "beginning," from Old French comencement "beginning, start" (Modern French commencement), from comencier (see commence). Meaning "school graduation ceremony" attested by 1850, American English. (Sense "entrance upon the privileges of a master or doctor in a university" is from late 14c.)
I know what you are thinking of -- the class members grouped in a semicircle on the stage, the three scared boys in new ready-made black suits, the seventeen pretty girls in fluffy white dresses (the gowns of the year), each senior holding a ribbon-tied manuscript bulging with thoughts on "Beyond the Alps Lies Italy," "Our Ship is Launched -- Whither Shall it Sail?" and similar topics. [Charles Moreau Harger, "The Real Commencement," "New Outlook," May 8, 1909]
publicist (n.): 1792, "person learned in public law or the law of nations," from public (adj.) + -ist. Also from 1795 in English as "writer on current topics," from French publiciste; in either case a hybrid.
Then crept in the "loose" usage. Anybody who wrote or spoke about public affairs came to be dubbed a publicist. It was only a question of time when the dam would give way and the word flow in all directions and be made to cover every kind of talent, or lack of it. ["The Nation," Nov. 22, 1917]
Meaning "press agent" is from 1925 (publicity agent attested by 1900); publicitor also was tried in this sense.
sensationalize (v.): 1863, from sensational + -ize. Originally of audiences as well as topics. Related: Sensationalized; sensationalizing.
topic (n.): 1630s, "a class of considerations from which probable arguments can be drawn," singular form of "Topics" (1560s), the name of a work by Aristotle on logical and rhetorical generalities, from Latin Topica, from Greek Ta Topika, literally "matters concerning topoi," "commonplaces," neuter plural of noun use of topikos "pertaining to a common place, of a place, local," from topos "place" (see topos). The meaning "matter treated in speech or writing, subject, theme" is first recorded 1720.
topical (adj.): 1580s, "pertaining to a place;" see topic + -al (1). Medical sense "applied to a particular part of the body" is from c. 1600. Meaning "of or pertaining to topics of the day" is from 1873. Related: Topically.
twilight (n.): "light from the sky when the sun is below the horizon at morning and evening," late 14c. (twilighting), a compound of twi- + light (n.) Cognate with Middle Flemish twilicht, Dutch tweelicht (16c.), Middle High German twelicht, German zwielicht. Exact connotation of twi- in this word is unclear, but it appears to refer to "half" light, rather than the fact that twilight occurs twice a day. Compare also Sanskrit samdhya "twilight," literally "a holding together, junction," Middle High German zwischerliecht, literally "tweenlight." Originally and most commonly in English with reference to evening twilight but occasionally used of morning twilight (a sense first attested mid-15c.). Figurative extension recorded from c. 1600.

Twilight zone is from 1901 in a literal sense, a part of the sky lit by twilight; from 1909 in extended senses in references to topics or cases where authority or behavior is unclear. In the 1909 novel "In the Twilight Zone," the reference is to mulatto heritage. "She was in the twilight zone between the races where each might claim her ...." The U.S. TV series of that name is from 1959.