altruism (n .)youdaoicibaDictYouDict
1853, "unselfishness, opposite of egoism," from French altruisme, coined or popularized 1830 by French philosopher Auguste Comte (1798-1857), from autrui, from Old French altrui, "of or to others," from Latin alteri, dative of alter "other" (see alter). Apparently suggested to Comte by French legal phrase l'autrui, or in full, le bien, le droit d'autrui. The -l- is perhaps a reinsertion from the Latin word.
There is a fable that when the badger had been stung all over by bees, a bear consoled him by a rhapsodic account of how he himself had just breakfasted on their honey. The badger replied peevishly, "The stings are in my flesh, and the sweetness is on your muzzle." The bear, it is said, was surprised at the badger's want of altruism. ["George Eliot," "Theophrastus Such," 1879]
breakfast (n.)youdaoicibaDictYouDict
mid-15c., from break (v.) + fast (n.). An Old English word for it was undernmete (see undern), also morgenmete "morning meal.". The verb is recorded from 1670s. Related: Breakfasted; breakfasting.

Spanish almuerzo "lunch," but formerly and still locally "breakfast," is from Latin admorsus, past participle of admordere "to bite into," from ad- "to" + mordere "to bite." In common with almuerzo, words for "breakfast" tend over time to shift in meaning toward "lunch;" compare French déjeuner "breakfast," later "lunch" (equivalent of Spanish desayuno "breakfast"), both from Vulgar Latin *disieiunare "to breakfast," from Latin dis- "apart, in a different direction from" + ieiunare, jejunare "fast" (see jejune; also compare dine). German Frühstück is from Middle High German vruostücke, literally "early bit."
fast (v.)youdaoicibaDictYouDict
"abstain from food," Old English fæstan "to fast" (as a religious duty), also "to make firm; establish, confirm, pledge," from Proto-Germanic *fastan "to hold fast, observe abstinence" (cognates: Old Frisian festia, Old High German fasten, German fasten, Old Norse fasta "abstain from food"), from the same root as fast (adj.).

The original meaning in prehistoric Germanic was "hold firmly," and the sense evolved via "have firm control of oneself," to "hold oneself to observance" (compare Gothic fastan "to keep, observe," also "to fast"). Perhaps the Germanic sense shifted through use of the native words to translate Medieval Latin observare in its sense "to fast." The verb in the sense "to make fast" continued in Middle English, but was superseded by fasten. Related: Fasted; fasting.
handfast (v.)youdaoicibaDictYouDict
"betroth (two people), bind in wedlock; pledge oneself to," early 12c., from Old English handfæsten and cognate Old Norse handfesta "to pledge, betroth; strike a bargain by shaking hands;" for first element see hand (n.); second element is from Proto-Germanic causative verb *fastjan "to make firm," from PIE *past- "solid, firm" (see fast (adj.). Related: Handfasted; handfasting. The noun in Old English was >handfæstung.
quarantine (n.)youdaoicibaDictYouDict
1520s, "period of 40 days in which a widow has the right to remain in her dead husband's house." Earlier quarentyne (15c.), "desert in which Christ fasted for 40 days," from Latin quadraginta "forty," related to quattuor "four" (see four).

Sense of "period a ship suspected of carrying disease is kept in isolation" is 1660s, from Italian quarantina giorni, literally "space of forty days," from quaranta "forty," from Latin quadraginta. So called from the Venetian custom of keeping ships from plague-stricken countries waiting off its port for 40 days (first enforced 1377) to assure that no latent cases were aboard. The extended sense of "any period of forced isolation" is from 1670s.