occultation (n.)youdaoicibaDictYouDict[occultation 词源字典]
early 15c., "disguise or concealment of identity," from Latin occultationem (nominative occultatio), noun of action from past participle stem of occultare "to hide, conceal," frequentative of occulere (see occult).[occultation etymology, occultation origin, 英语词源]