propagandayoudaoicibaDictYouDict[propaganda 词源字典]
propaganda: [18] English gets the word propaganda from the term Propaganda Fide, the name of a Roman Catholic organization charged with the spreading of the gospel. This meant literally ‘propagating the faith’, prōpāgānda being the feminine gerundive of Latin prōpāgāre, source of English propagate [16]. Originally prōpāgāre was a botanical verb, as its English descendant remains, only secondarily broadening out metaphorically to ‘extend, spread’.

It was derived from the noun prōpāgo ‘cutting, scion’, which in turn was formed from the prefix prō- ‘forth’ and the base *pāg- ‘fix’ (source of English pagan, page, pale ‘stake’, etc).
=> pagan, page, pale, propagate[propaganda etymology, propaganda origin, 英语词源]
propaganda (n.)youdaoicibaDictYouDict
1718, "committee of cardinals in charge of Catholic missionary work," short for Congregatio de Propaganda Fide "congregation for propagating the faith," a committee of cardinals established 1622 by Gregory XV to supervise foreign missions. The word is properly the ablative fem. gerundive of Latin propagare (see propagation). Hence, "any movement to propagate some practice or ideology" (1790). Modern political sense dates from World War I, not originally pejorative. Meaning "material or information propagated to advance a cause, etc." is from 1929.
propagate (v.)youdaoicibaDictYouDict
1560s, "to cause to multiply," from Latin propagatus, past participle of propagare "to set forward, extend, procreate" (see propagation). Intransitive sense "reproduce one's kind" is from c. 1600. Related: Propagated; propagating.
propagation (n.)youdaoicibaDictYouDict
mid-15c., from Old French propagacion "offshoot, offspring" (13c.) and directly from Latin propagationem (nominative propagatio) "a propagation, extension, enlargement," noun of action from past participle stem of propagare "set forward, extend, spread, increase; multiply plants by layers, breed," from propago (genitive propaginis) "that which propagates, offspring," from pro- "forth" (see pro-) + *pag-, root of pangere "to fasten" (see pact).
propagableyoudaoicibaDictYouDict
"Capable of being propagated", Mid 17th cent.; earliest use found in Noah Biggs (fl. 1651), medical practitioner and social reformer. From classical Latin propāgāre, prōpāgāre propagate + -ble.