sentient (adj.)youdaoicibaDictYouDict[sentient 词源字典]
1630s, "capable of feeling," from Latin sentientem (nominative sentiens) "feeling," present participle of sentire "to feel" (see sense (n.)). Meaning "conscious" (of something) is from 1815.[sentient etymology, sentient origin, 英语词源]
sentiment (n.)youdaoicibaDictYouDict
late 14c., sentement, "personal experience, one's own feeling," from Old French sentement (12c.), from Medieval Latin sentimentum "feeling, affection, opinion," from Latin sentire "to feel" (see sense (n.)).

Meaning "what one feels about something" (1630s) and modern spelling seem to be a re-introduction from French (where it was spelled sentiment by 17c.). A vogue word mid-18c. with wide application, commonly "a thought colored by or proceeding from emotion" (1762), especially as expressed in literature or art. The 17c. sense is preserved in phrases such as my sentiments exactly.
sentimental (adj.)youdaoicibaDictYouDict
1749, "pertaining to or characterized by sentiment," from sentiment + -al (1). At first without pejorative connotations; meaning "having too much sentiment, apt to be swayed by prejudice" had emerged by 1793 (implied in sentimentalist). Related: Sentimentally.
sentimentalism (n.)youdaoicibaDictYouDict
1801, from sentimental + -ism.
sentimentalist (n.)youdaoicibaDictYouDict
1768, from sentimental + -ist.
sentimentality (n.)youdaoicibaDictYouDict
1768, from sentimental + -ity.
sentimentalize (v.)youdaoicibaDictYouDict
1764, intransitive, "indulge in sentiments," from sentimental + -ize. Meaning "to make sentimental" (transitive) is from 1813. Related: Sentimentalized; sentimentalizing.
Think on these things, and let S______ go to Lincoln sessions by himself, and talk classically with country justices. In the meantime we will philosophize and sentimentalize;--the last word is a bright invention of the moment in which it was written, for yours or Dr. Johnson's service .... [Laurence Sterne, letter to William Combe, Esq., dated Aug. 5, 1764, published 1787]
sentinel (n.)youdaoicibaDictYouDict
1570s, from Middle French sentinelle (16c.), from Italian sentinella "a sentinel." OED says "No convincing etymology of the It. word has been proposed," but perhaps (via a notion of "perceive, watch"), from sentire "to hear," from Latin sentire "feel, perceive by the senses" (see sense (n.)).
sentry (n.)youdaoicibaDictYouDict
1610s, originally "watchtower;" perhaps a shortened variant of sentinel, which had a variant form centrinel (1590s); or perhaps worn down from sanctuary, on notion of "shelter for a watchman." Meaning "military guard posted around a camp" is first attested 1630s. Sentry-box is from 1728.
SeoulyoudaoicibaDictYouDict
South Korean capital, from Korean soul, literally "capital." It was the national capital from 1392 until Japanese annexation in 1910.
sepal (n.)youdaoicibaDictYouDict
"leaf of the calyx," 1821, from French sépal, from Modern Latin sepalum (H.J. de Necker, 1790), coined from Latin separatus "separate, distinct" (see separate (v.)) + petalum "petal" (see petal).
separable (adj.)youdaoicibaDictYouDict
late 14c., from Latin separabilis, from separare (see separate (v.)). Related: Separability.
separate (v.)youdaoicibaDictYouDict
late 14c., from Latin separatus, past participle of separare "to pull apart," from se- "apart" (see secret) + parare "make ready, prepare" (see pare). Sever (q.v.) is a doublet, via French. Related: Separated; separating.
separate (adj.)youdaoicibaDictYouDict
"detached, kept apart," c. 1600, from separate (v.) or from Latin separatus. Separate but equal in reference to U.S. segregation policies on railroads is attested from 1888. Separate development, official name of apartheid in South Africa, is from 1955. Related: Separately (1550s); separateness.
Frequently the colored coach is little better than a cattle car. Generally one half the smoking car is reserved for the colored car. Often only a cloth curtain or partition run half way up separates this so-called colored car from the smoke, obscene language, and foul air of the smokers' half of the car. All classes and conditions of colored humanity, from the most cultured and refined to the most degraded and filthy, without regard to sex, good breeding or ability to pay for better accommodation, are crowded into this separate, but equal (?) half car. [Rev. Norman B. Wood, "The White Side of a Black Subject," 1897]
separated (adj.)youdaoicibaDictYouDict
1530s, past participle adjective from separate (v.). In reference to married couples deciding to live apart, from 1878.
separates (n.)youdaoicibaDictYouDict
"articles of (women's) clothing that may be worn in various combinations," 1945, from separate (adj.). As a noun, separate is attested from 1610s in the sense "separatist."
separation (n.)youdaoicibaDictYouDict
c. 1400, from Old French separacion (Modern French séparation), from Latin separationem (nominative separatio) noun of action from past participle stem of separare (see separate (v.)). Specific sense of "sundering of a married couple" is attested from c. 1600. Sense in photography is from 1922. Separation of powers first recorded 1788, in "Federalist" (Hamilton), from French séparée de la puissance (Montesquieu, 1748). Separation anxiety first attested 1943.
separationist (n.)youdaoicibaDictYouDict
1831, from separation + -ist.
separatism (n.)youdaoicibaDictYouDict
1620s, from separate + -ism. First used in a denominational religious sense; from 1866 in a political sense.
separatistyoudaoicibaDictYouDict
c. 1600, from separate + -ist. First used in a denominational religious sense; of political separations from 1871.