seventh Look up seventh at Dictionary.com
c. 1300, from seven + -th (1); earlier sevende, seveth, from Old English seofunda (Anglian, Northumbrian), seofoþa (West Saxon), from Proto-Germanic *sebundon (source also of Old Norse sjaundi, Old Saxon sivondo, Old High German sibunto, German siebente, siebte). The music note sense is from 1590s.
seventies (n.) Look up seventies at Dictionary.com
1859 as the years of someone's life between 70 and 79; from 1837 as the eighth decade of years in a given century. See seventy.
seventieth (adj.) Look up seventieth at Dictionary.com
late 13c., from seventy + -th (1).
seventy Look up seventy at Dictionary.com
Old English (hund)seofontig, from seofon (see seven) + -tig (see -ty (1)). Similar formation in Old Frisian soventich, Middle Dutch seventich, Old Norse sjau tiger.
sever (v.) Look up sever at Dictionary.com
c. 1300, from Anglo-French severer, Old French sevrer "to separate" (12c., later in French restricted to "to wean," i.e. "to separare from the mother"), from Vulgar Latin *seperare, from Latin separare "to separate" (see separate (v.)).
several (adj.) Look up several at Dictionary.com
early 15c., "existing apart," from Anglo-French several, from Middle French seperalis "separate," from Medieval Latin separalis, from Latin separ "separate, different," back-formation from separare "to separate" (see separate (v.)). Meaning "various, diverse, different" is attested from c. 1500; that of "more than one" is from 1530s, originally in legal use.
Here we are all, by day; by night we're hurled
By dreams, each one into a several world
[Herrick, 1648]
Related: Severalty. Jocular ordinal form severalth attested from 1902 in American English dialect (see -th (2)).
severally (adv.) Look up severally at Dictionary.com
"separately," late 14c., from several + -ly (2).
severance (n.) Look up severance at Dictionary.com
early 15c., from Anglo-French, from Old French sevrance "separation, parting," from sevrer (see sever). Meaning "discharge from employment contract" is attested from 1941. Severance pay attested by 1942.
severe (adj.) Look up severe at Dictionary.com
1540s, from Middle French severe (12c., Modern French sévère) or directly from Latin severus "serious, grave, strict, austere" (see severity). From 1660s with reference to styles or tastes; from 1725 of diseases.
severely (adv.) Look up severely at Dictionary.com
1540s, from severe + -ly (2). Colloquial sense of "excessively" attested by 1854.
severity (n.) Look up severity at Dictionary.com
late 15c., "austerity or strictness of life," from Middle French severite, from Latin severitas "seriousness, strictness, sternness," from severus "stern, strict, serious," of uncertain origin. Possibly from PIE root *segh- "to have, hold" (see scheme (n.)), or possibly from *se vero "without kindness," from se "without" (see secret (n.)) + *vero "kindness," neuter ablative of verus "true" (see very). Meaning "strictness in dealing with others" is recorded from 1520s.
Seville Look up Seville at Dictionary.com
inland port city in Spain, Spanish Sevilla, ultimately from Phoenician, from sefela "plain, valley."
sew (v.) Look up sew at Dictionary.com
Old English siwian "to stitch, sew, mend, patch, knit together," earlier siowian, from Proto-Germanic *siwjanan (source also of Old Norse syja, Swedish sy, Danish sye, Old Frisian sia, Old High German siuwan, Gothic siujan "to sew"), from PIE root *syu- "to bind, sew" (source also of Sanskrit sivyati "sews," sutram "thread, string;" Greek hymen "thin skin, membrane," hymnos "song;" Latin suere "to sew, sew together;" Old Church Slavonic šijo "to sew," šivu "seam;" Lettish siuviu, siuti "to sew," siuvikis "tailor;" Russian švec "tailor"). Related: Sewed; sewing. To sew (something) up "bring it to a conclusion" is a figurative use attested by 1904.
sewage (n.) Look up sewage at Dictionary.com
1818, from sew (v.) "to drain, draw off water" (late 15c., from sewer (n.1)) + -age.
sewer (n.1) Look up sewer at Dictionary.com
c. 1400, "conduit," from Anglo-French sewere, Old North French sewiere "sluice from a pond" (13c.), literally "something that makes water flow," from shortened form of Gallo-Roman *exaquaria (source of Middle French esseveur), from Latin ex- "out" (see ex-) + aquaria, fem. of aquarius "pertaining to water," from aqua "water" (see aqua-).

Specifically of underground channels for wastewater from c. 1600; figurative use of this is from 1640s.
sewer (n.2) Look up sewer at Dictionary.com
"one who sews," late 14c., agent noun from sew (v.).
sewerage (n.) Look up sewerage at Dictionary.com
1832, from sewer (n.1) + -age.
sewing (n.) Look up sewing at Dictionary.com
late 13c., "action of sewing;" c. 1400, "sewn work," verbal noun from sew (v.). Sewing machine is attested from 1847.
sex (v.) Look up sex at Dictionary.com
1884, "to determine the sex of," from sex (n.); to sex (something) up "increase the sex appeal of" is recorded from 1942. Related: Sexed; sexing.
sex (n.) Look up sex at Dictionary.com
late 14c., "males or females collectively," from Latin sexus "a sex, state of being either male or female, gender," of uncertain origin. "Commonly taken with seco as division or 'half' of the race" [Tucker], which would connect it to secare "to divide or cut" (see section (n.)). Meaning "quality of being male or female" first recorded 1520s. Meaning "sexual intercourse" first attested 1929 (in writings of D.H. Lawrence); meaning "genitalia" is attested from 1938. Sex appeal attested by 1904.
For the raw sex appeal of the burlesque "shows" there is no defense, either. These "shows" should be under official supervision, at the least, and boys beneath the age of eighteen forbidden, perhaps, to attend their performance, just as we forbid the sale of liquors to minors. [Walter Prichard Eaton, "At the New Theatre and Others: The American Stage, Its Problems and Performances," Boston, 1910]
Sex drive is from 1918; sex object is 1901; sex symbol is 1871 in anthropology; the first person to whom the term was applied seems to have been Marilyn Monroe (1959). Sex therapist is from 1974.
sexagenarian (n.) Look up sexagenarian at Dictionary.com
1738, "person sixty years old," from Latin sexagenarius "containing sixty," from sexagenarius, from sexageni "sixty each, sixty at a time," from sexaginta "sixty," from comb. form of sex (see six) + -genaria "ten times," from -ginta "tens," from PIE *dkm-ta-, from *dekm- "ten" (see ten). As an adjective from 1836.
sexagesimal (adj.) Look up sexagesimal at Dictionary.com
"pertaining to 60," 1680s, from Medieval Latin sexagesimalis, from Latin sexagesimus "the sixtieth," from sexaginta "sixty."
sexiness (n.) Look up sexiness at Dictionary.com
1922, from sexy + -ness.
sexism (n.) Look up sexism at Dictionary.com
1968; see sexist + -ism.
sexist (adj.) Look up sexist at Dictionary.com
1965, from sex (n.) on model of racist, coined by Pauline M. Leet, director of special programs at Franklin & Marshall College, Lancaster, Pennsylvania, U.S., in a speech which was circulated in mimeograph among feminists. Popularized by use in print in Caroline Bird's introduction to "Born Female" (1968).
sexless (adj.) Look up sexless at Dictionary.com
1590s, from sex (n.) + -less. Related: Sexlessly; sexlessness.
sexology (n.) Look up sexology at Dictionary.com
1902, from sex (n.) + -ology. Related: Sexologist.
sexpert (n.) Look up sexpert at Dictionary.com
"sex therapist," 1924, from jocular merger of sex (n.) + expert.
sexploitation (n.) Look up sexploitation at Dictionary.com
1942, from sex (n.) + exploitation. Other similar coinages include sexpert (1924); sexcapade (1953); sexational (1927); and sexophone in "Brave New World."
sexpot (n.) Look up sexpot at Dictionary.com
"erotically willing and desirable female," 1929, from sex (n.) + pot (n.1), perhaps suggested by fleshpot.
sext (v.) Look up sext at Dictionary.com
by 2005, from contraction of sex (n.) + text (v.). Related: Sexted; sexting.
sext (n.) Look up sext at Dictionary.com
early 15c., "third of the lesser canonical hours," from Latin sexta (hora), fem. of sextus, ordinal of sex (see six).
sextant (n.) Look up sextant at Dictionary.com
instrument for determining latitude, 1620s, from Modern Latin sextans, said to have been coined c. 1600 by Danish astronomer Tycho Brahe, from Latin sextans "a sixth," from sex "six" (see six). So called because the sextans has a graduated arc equal to a sixth part of a circle.
sextet (n.) Look up sextet at Dictionary.com
1841, altered (by influence of German Sextett) from sestet.
sextile Look up sextile at Dictionary.com
1550s (adj.), "at a distance of 60 degrees;" 1590s (n.); from Latin sextilis (adj.) "the sixth," from sextus "sixth" (ordinal number; see Sextus).
sextillion (n.) Look up sextillion at Dictionary.com
1680s, from Latin sext-, comb. form of sex "six" (see six) + (m)illion. Compare billion. Related: Sextillionth.
sexton (n.) Look up sexton at Dictionary.com
c. 1300, sekesteyn, "person in charge of the sacred objects of a church," from Old French segrestien, from Medieval Latin sacristanus (see sacristan). Sense of "custodian of a church" first recorded 1580s. Fem. forms sextress, sextrice are recorded 15c., but the usual form is sextoness (early 15c.).
sextuple (adj.) Look up sextuple at Dictionary.com
"sixfold," 1620s, from Latin sextus "sixth" (from sex "six;" see six) + -plus "more" (see plus).
sextuplet (n.) Look up sextuplet at Dictionary.com
1852, from adjective sextuple (1620s); patterned on triplet, etc.
Sextus Look up Sextus at Dictionary.com
masc. proper name, from Latin, properly "the sixth," originally denoting a sixth child, from sextus "sixth," from sex "six" (see six; also see Octavian).
sexual (adj.) Look up sexual at Dictionary.com
1650s, "of or pertaining to the fact of being male or female," from Late Latin sexualis "relating to sex," from Latin sexus (see sex (n.)). Meaning "pertaining to copulation or generation" is from 1766; sexual intercourse attested by 1771; sexual orientation by 1967; sexual harassment by 1975. Sexual revolution attested by 1962. Sexual politics is from 1970. Related: Sexually.
sexuality (n.) Look up sexuality at Dictionary.com
1789, "action or fact of being sexual;" see sexual + -ity. Meaning "capability of sexual feelings" is from 1879. Meaning "sexual identity" is by 1980.
sexualization (n.) Look up sexualization at Dictionary.com
1872, noun of action from sexualize.
sexualize (v.) Look up sexualize at Dictionary.com
1839, from sexual + -ize. Related: Sexualized; sexualizing.
sexy (adj.) Look up sexy at Dictionary.com
1905, from sex (n.) + -y (2). Originally "engrossed in sex;" sense of "sexually attractive" is 1923, first in reference to Valentino. An earlier word in this sense was sexful (1898). Related: Sexier; sexiest.
Seychelles Look up Seychelles at Dictionary.com
renamed 1756 in honor of French finance minister Jean Moreau de Séchelles; spelling altered 1794 by the English when they took the islands from France. Related: Seychellois.
sforzando (adj.) Look up sforzando at Dictionary.com
"with sudden energy or impulse," 1801, from Italian sforzando, gerundive of sforza "to force" (see effort).
sfumato (adj.) Look up sfumato at Dictionary.com
1847, from Italian sfumato, literally "smoked," from Latin fumus "smoke" (see fume (n.)).
sh (interj.) Look up sh at Dictionary.com
exclamation used to urge or request silence, 1847. The gesture of putting a finger to the lips to express silence is attested from Roman times. As a transitive verb from 1887; intransitive from 1925.
sh- Look up sh- at Dictionary.com
sound represented in Old English by -sc- (fisc "fish"), which originally was pronounced "-sk-" but which by late Old English had softened to "-sh-." Modern English words with -sc- mostly are imports (generally Scandinavian).

The "sh" sound did not exist in Old French, therefore French scribes after the Norman conquest often represented it with -ssh- in medial and final positions, and sch- in initial positions (schape, schamful, schaft for shape, shameful, shaft). But the spelling -sh- has been standard since Caxton, probably as a worn-down form of Middle English -sch-.

In some East Anglian texts from 14c.-15c., x- is used (xal, xulde for shall, should), which would have given the language a very different look had it prevailed, but the London-based sh- ended up as the standard form. The same Germanic sound has become, by natural evolution, modern German and Dutch sch-, Scandinavian sk-.