One way to hold this word: picture one person at the top whose word simply ends the matter. There is nobody above them and nobody who can say no. Orders travel in one direction only, . That picture does not change when the word moves from a country to an office; only the size of the room changes.
可以想成一個畫面：有一個人站在最上面，他說了就算。上面沒有人，旁邊也沒有人能反對。命令只往一個方向走，由上往下。這個畫面從國家搬到辦公室的時候，內容其實沒有變，只是房間變小了。統治一個國家的人是這樣，開會時不讓人把話講完的主管也是這樣。
From the word’s history
The word is built from dictator plus -ial, so its literal reading is simply of the dictator type.
字面上是 dictator（獨裁者）加上 -ial（……的），也就是「獨裁者那一型的」。這條線索很直接：不管拿來講國家還是講人，說的都是同一件事——像獨裁者一樣，說了就算。
Wiktionary etymology for dictatorial (packet evidence): From dictator + -ial.
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