comity (n.)youdaoicibaDictYouDict[comity 词源字典]
early 15c., "association," from French comité, from Latin comitas "courtesy, friendliness, kindness, affability," from comis "courteous, friendly, kind," which is of uncertain origin. Meaning "courtesy" in English is from 1540s. Phrase comity of nations attested from 1862: "The obligation recognized by civilized nations to respect each other's laws and usages as far as their separate interests allow."[comity etymology, comity origin, 英语词源]
cordially (adv.)youdaoicibaDictYouDict
late 15c., "by heart," from cordial + -ly (2). Meaning "heartily" is from 1530s; weakened sense of "with friendliness" is attested by 1781.
fellowship (n.)youdaoicibaDictYouDict
c. 1200, feolahschipe "companionship," from fellow + -ship. Sense of "a body of companions" is from late 13c. Meaning "spirit of comradeship, friendliness" is from late 14c. As a state of privilege in English colleges, from 1530s. In Middle English it was at times a euphemism for "sexual intercourse" (carnal fellowship).
To fellowship with is to hold communion with; to unite with in doctrine and discipline. This barbarism now appears with disgusting frequency in the reports of ecclesiastical conventions, and in the religious newspapers generally. [Bartlett, "Dictionary of Americanisms," 1848]
But Chaucer and Wyclif used it as a verb in Middle English, "to have fellowship with."
friendly (adj.)youdaoicibaDictYouDict
Old English freondlic "well-disposed, kindly;" see friend (n.) + -ly (1). Related: Friendlily; friendliness. As an adverb Old English had freondliche, but by 14c. as the inflections wore off in English it had become indistinguishable from the adjective. Probably owing to that it is rare in modern use; friendfully (mid-15c.) and the correct but ungainly friendlily (1670s) never caught on.
homeliness (n.)youdaoicibaDictYouDict
mid-14c., from homely + -ness. Originally "meekness, gentleness," also "familiarity, intimacy; friendliness;" sense degenerated by c. 1400 to "want of refinement in manners, coarseness; presumptuousness."
hospitality (n.)youdaoicibaDictYouDict
late 14c., "act of being hospitable," from Old French hospitalité, from Latin hospitalitem (nominative hospitalitas) "friendliness to guests," from hospes (genitive hospitis) "guest" (see host (n.1)).
love (n.)youdaoicibaDictYouDict
Old English lufu "love, affection, friendliness," from Proto-Germanic *lubo (cognates: Old High German liubi "joy," German Liebe "love;" Old Norse, Old Frisian, Dutch lof; German Lob "praise;" Old Saxon liof, Old Frisian liaf, Dutch lief, Old High German liob, German lieb, Gothic liufs "dear, beloved").

The Germanic words are from PIE *leubh- "to care, desire, love" (cognates: Latin lubet, later libet "pleases;" Sanskrit lubhyati "desires;" Old Church Slavonic l'ubu "dear, beloved;" Lithuanian liaupse "song of praise").
"Even now," she thought, "almost no one remembers Esteban and Pepita but myself. Camilla alone remembers her Uncle Pio and her son; this woman, her mother. But soon we shall die and all memory of those five will have left the earth, and we ourselves shall be loved for a while and forgotten. But the love will have been enough; all those impulses of love return the love that made them. Even memory is not necessary for love. There is a land of the living and a land of the dead and the bridge is love, the only survival, the only meaning." [Thornton Wilder, "Bridge of San Luis Rey," 1927]
Meaning "a beloved person" is from early 13c. The sense "no score" (in tennis, etc.) is 1742, from the notion of "playing for love," i.e. "for nothing" (1670s). Phrase for love or money "for anything" is attested from 1580s. Love seat is from 1904. Love-letter is attested from mid-13c.; love-song from early 14c. To fall in love is attested from early 15c. To be in love with (someone) is from c. 1500. To make love is from 1570s in the sense "pay amorous attention to;" as a euphemism for "have sex," it is attested from c. 1950. Love life "one's collective amorous activities" is from 1919, originally a term in psychological jargon. Love affair is from 1590s. The phrase no love lost (between two people) is ambiguous and was used 17c. in reference to two who love each other well (c. 1640) as well as two who have no love for each other (1620s).
neighborhood (n.)youdaoicibaDictYouDict
mid-15c., "neighborly conduct, friendliness," from neighbor (n.) + -hood. Modern sense of "community of people who live close together" is first recorded 1620s. Phrase in the neighborhood of meaning "near, somewhere about" is first recorded 1857, American English. The Old English word for "neighborhood" was neahdæl.
social (adj.)youdaoicibaDictYouDict
late 15c., "devoted to or relating to home life;" 1560s as "living with others," from Middle French social (14c.) and directly from Latin socialis "of companionship, of allies; united, living with others; of marriage, conjugal," from socius "companion, ally," probably originally "follower," from PIE *sokw-yo-, suffixed form of root *sekw- (1) "to follow," and thus related to sequi "to follow" (see sequel). Compare Old English secg, Old Norse seggr "companion," which seem to have been formed on the same notion). Related: Socially.

Sense of "characterized by friendliness or geniality" is from 1660s. Meaning "living or liking to live with others; companionable, disposed to friendly intercourse" is from 1720s. Meaning "of or pertaining to society as a natural condition of human life" first attested 1695, in Locke. Sense of "pertaining to fashionable society" is from 1873.

Social climber is from 1893; social work is 1890; social worker 1886. Social drinking first attested 1807. Social studies as an inclusive term for history, geography, economics, etc., is attested from 1916. Social security "system of state support for needy citizens" is attested from 1907 (the Social Security Act was passed by U.S. Congress in 1935). Social butterfly is from 1867, in figurative reference to "flitting."

Social contract (1763) is from translations of Rousseau. Social Darwinism attested from 1887. Social engineering attested from 1899. Social science is from 1785. In late 19c. newspapers, social evil is "prostitution." Social justice is attested by 1718; social network by 1971; social networking by 1984; social media by 2008.
unfriendly (adj.)youdaoicibaDictYouDict
early 15c., "not characteristic of friends, hostile, inimical," from un- (1) "not" + friendly. Similar formation in Middle Dutch onvriendelijc, Middle High German unvriuntlich, German unfreundlich. Old English had unferondlice "unkindly." Related: Unfriendliness.
XeniayoudaoicibaDictYouDict
city in Ohio, from Greek xenia "hospitality, rights of a guest, friendly relation with strangers," literally "state of a guest," from xenos "guest" (see guest (n.)). Founded 1803 and named by vote of a town meeting, on suggestion of the Rev. Robert Armstrong to imply friendliness and hospitality.