officer, official

名詞 official:

1. a worker who holds or is invested with an office
   同義詞：functionary
2. someone who administers the rules of a game or sport

形容詞 official:

1. having official authority or sanction
2. of or relating to an office
3. verified officially
4. conforming to set usage, procedure, or discipline
   同義詞：prescribed
5. (of a church) given official status as a national or state institution

1. The protesters showed their defiance of the official ban on demonstrations.
   抗議者藐視官方的示威禁令。
2. He is a pompous official.
   他是個自命不凡的官員。
3. I happen to have the official statistics with me.
   我碰巧身邊有官方的統(tǒng)計數(shù)字。
4. The mayor is a considerable official.
   市長是一位重要的官員。
5. The group have split away/off from the official union.
   這一部分人已從正式的聯(lián)盟中分裂出來了。
6. They expressed their dissent from official policy.
   他們對官方的政策表示出異議。
7. She received several official letters this morning.
   她今天早晨收到了幾封公函。
8. An official of the local government called to see him.
   當?shù)卣晃还賳T來看他。

of.fi.cial

adj.Abbr. off.（形容詞）縮寫 off.
Of or relating to an office or a post of authority:
職務上的：與職務或權力職位有關的：
例句：
official duties.
公務

Authorized by a proper authority; authoritative:
有權威的：由適當權力機構授于的：
例句：
official permission.
正式批準

Holding office or serving in a public capacity:
供職的：供職或在公共職能部門中服務：
例句：
an official representative.
一個官方的代表

Characteristic of or befitting a person of authority; formal:
正式：以權威人物為主的或適合權于威人物的；正式：
例句：
an official banquet.
一次正式宴會

Authorized by or contained in the U.S. Pharmacopoeia or National Formulary. Used of drugs.
（藥）法定的：美國的藥書或藥典授權的或含有的。用于藥物
n.Abbr. off.（名詞）縮寫 off.
One who holds an office or a position, especially one who acts in a subordinate capacity for an institution such as a corporation or governmental agency.
公務員，職員：一個供職的人，尤指在如公司或政府機構的下屬機構工作的人
Sports A referee or an umpire.
【體育運動】 裁判

來源：
From Middle English [ecclesiastical officer]
源自 中古英語 [教會的人員]
from Old French
源自 古法語
from Latin offici3lis [an attendant of an office]
源自 拉丁語 offici3lis [辦公室的服務人員]
from officium [duty, service] * see office
源自 officium [責任，服務] *參見 office

【引伸】
offi.cialdom
n.（名詞）
offi.cially
adv.（副詞）