compulsory
compellere(com-"with, together" + pellere "to drive" →compel)から
/icons/point.icon mandatory vs. compulsory vs. obligatory
Ask The Editor: compulsory, mandatory, and obligatory
obligatoryは口語ではめったに使われない
/icons/point.icon mandatory vs. compulsory
word usage - Differences between "mandatory" and "compulsory" - English Language Learners Stack Exchange
Mandatory and Compulsory are two words that are often confused when it comes to their meanings and connotations. Strictly speaking, there is some difference between the two words. The word ‘mandatory’ is generally used in the sense of ‘binding’. On the other hand, the word ‘compulsory’ is generally used in the sense of ‘essential’. This is the main difference between the two words.
mandatoryとcompulsoryは意味と含意にふれるときにしばしば混同される2つの言葉だ。厳密に言うと、2つの言葉には若干の違いがある。mandatoryという言葉は一般的に「拘束力がある」という意味で使われる。他方、compulsoryという言葉は一般的に「必要不可欠な」という意味で使われる。これが2つの言葉の主要な違いだ。
compulsory education: 義務教育
compulsory service: 兵役
mandatory minimum sentences: 必要的最低刑(量刑の最低限の規定)
mandatory retirement: 強制(定年)退職
It is important to note that anything that is mandatory has the quality of binding the doer to the work. On the other hand, anything that is compulsory has to be essentially done without postponement. The word ‘compulsory’ often refers to things or requirements. On the other hand, the word ‘mandatory’ often refers to conditions. ...
どのmandatoryなものもその仕事に対する実行者を拘束する性質を持っているということを覚えることは重要だ。他方、どのcompulsoryなものも基本的に延期なしに行われなければならない。compulsoryという言葉はしばしば物や要件に言及する。他方、mandatoryという言葉はしばしば状態に言及する。
https://gyazo.com/08119f348877fc5fa8c05a81afa06067
source: 臨時召集令状（赤紙）裏面 | 奈良県立図書情報館
adjective
required by law or a rule; obligatory: 法律と規則に必要とされる; 義務的な
比較なし 〈事･物が〉(法律･制度により)義務的な, 強制的な(obligatory)(↔ voluntary); 〈学校などの科目が〉必修の(↔ optional, elective)
e.g. compulsory military service: 義務的な兵役
e.g. it was compulsory to attend mass.: ミサに参加することは義務だった。
involving or exercising compulsion; coercive: 強制力を伴う、用いる; 強制的な
e.g. the abuse of compulsory powers.: 強制的な権力の乱用
DERIVATIVES
compulsorily | kəmˈpəls(ə)rəlē | adverb
compulsoriness | kəmˈpəls(ə)rēnəs | noun
ORIGIN
early 16th century (as a noun denoting a legal mandate which had to be obeyed): from medieval Latin compulsorius, from compuls- ‘driven, forced’, from the verb compellere (see compel).