名詞 mandatory:

1. the recipient of a mandate
   同義詞：mandatary
2. a territory surrendered by Turkey or Germany after World War I and put under the tutelage of some other European power until they are able to stand by themselves
   同義詞：mandate

形容詞 mandatory:

1. required by rule
   同義詞：compulsory, required

1. The predetermined mandatory order, organization or position of symbols in a computer instruction, data or word, data transmission message, etc. The order is mandatory so that the computer can understand and interpret the information.
   對計算機(jī)的指令、數(shù)據(jù)或字以及數(shù)據(jù)傳輸所預(yù)先確定的且必須遵循的各種符號的次序、結(jié)構(gòu)或位置。次序必須遵循，否則計算機(jī)不能理解和解釋信息。
2. It's mandatory to pay taxes.
   繳稅是義務(wù)性的。

man.da.to.ry

adj.（形容詞）
Required or commanded by authority; obligatory:
強(qiáng)制的：權(quán)威當(dāng)局所要求或命令的，必須履行的：
例句：
Attendance at the meeting is mandatory.
出席會議是必要的

Of, having the nature of, or containing a mandate.
命令的：屬于或擁有或具有訓(xùn)令特征的
Holding a League of Nations mandate over a territory.
受委托的：受國際聯(lián)盟的委托而掌管統(tǒng)治某地區(qū)的
n.（名詞）
【復(fù)數(shù)】 man.da.to.ries
A mandatary.
受托管理者