assessyoudaoicibaDictYouDict[assess 词源字典]
assess: [15] The literal meaning of Latin assidēre, ultimate source of assess, was ‘sit beside someone’ (it was a compound verb formed from the prefix ad- ‘near’ and sedēre ‘sit’, a relative of English sit). This developed the secondary meaning ‘sit next to a judge and assist him in his deliberations’ (which lies behind English assize), and in medieval Latin the sense passed from helping the judge to performing his functions, particularly in fixing the amount of a fine or tax to be paid.

Hence English assess, which came via Old French assesser from Latin assess-, the past participial stem of assidēre. (The Latin adjective assiduus, formed from assidēre in the sense ‘apply oneself to something’, gave English assiduous [16].)
=> assiduous, assize, session, sit, size[assess etymology, assess origin, 英语词源]
assess (v.)youdaoicibaDictYouDict
early 15c., "to fix the amount (of a tax, fine, etc.)," from Anglo-French assesser, from Medieval Latin assessare "fix a tax upon," originally frequentative of Latin assessus "a sitting by," past participle of assidere "to sit beside" (and thus to assist in the office of a judge), from ad- "to" (see ad-) + sedere "to sit" (see sedentary). One of the judge's assistant's jobs was to fix the amount of a fine or tax. Meaning "to estimate the value of property for the purpose of taxing it" is from 1809; transferred sense of "to judge the value of a person, idea, etc." is from 1934. Related: Assessed; assessing.