observation (n.)youdaoicibaDictYouDict[observation 词源字典]
late 14c., "performance of a religious rite," from Latin observationem (nominative observatio) "a watching over, observance, investigation," noun of action from past participle stem of observare (see observe). Sense of "act or fact of paying attention" is from 1550s. Meaning "a remark in reference to something observed" first recorded 1590s.[observation etymology, observation origin, 英语词源]