根据英国剑桥大学的解释，Decimate这个字的原意为 “to kill a large number of something, or to reduce something severely”，即毁灭，大量杀戮；大幅削减之意。
但实际上这个字的拉丁文字根为decem为「十」（ten）之意，同decimal（十进位）的字根相同，因此延伸至占星学后特别是指自某宫位或星座的第十宫注视的四分相之意，也可称为支配（Overcoming）或「优势四分相」（Superior square）。
十宫压制或支配的概念源自周日运动中，行星先于另一颗行星从东方地平线升起的现象。此时就好像后面的行星注视着前行的行星升起，而前行的行星则对后面的行星有着领导的作用。
这也好比先进入某个专业领域的前辈对后辈有着管理或支配的作用，后辈在学习的过程中，不免会将前辈视为榜样，因而产生尊敬甚至听命于他的感受。但实际上压制或支配不仅作用于四分相，三分相甚至是六分相也有支配或压制的作用，只是四分相的压力最大。
从宫位的角度来看，第十宫也代表权威之宫，当有行星自权威之宫来注视时，可以想像被注视的行星会有多么的戒慎恐惧或身不由己。不过此时仍要视在第十宫的行星是吉星或凶星。大致说来，若由吉星支配或压制，虽有压力但仍属吉象；若为凶星则凶上加凶。
都勒斯的《占星诗集》的中就有许多篇幅讨论支配／压制的概念，不过在书中他多数是以Look down (from the tenth house) at /upon （自第十宫往下注视）的说法来阐释:
If Saturn looked down at Jupiter from the square, it will diminish him in his assets and what things he thinks about, and it will come to bad consequences, and his actions will be interrupted, and he will be corrupting to his parents. And in both of the two squares the assets of his parents will be corrupted and toppled, and that will become evil if they exchanged their places, so that Saturn was the one above Jupiter and Jupiter was in the left square of Saturn. But if Jupiter was the one looking down upon Saturn, then it is less for its evil, and his parents will not get exaltation except in some of the households, and there will be a restriction in his assets, with neither wealth nor poverty.
若土星从上方以四分相往下注视木星，将减少命主的资产与所求之事，并招致坏的结果。命主的行动将备受阻碍，对父母亦造成伤害。两种四分相都会让父母的资产遭受损伤及毁灭，且若两者交换位置——即土星在木星的上方、木星在左方四分土星，则伤害更甚。但若为木星往下注视土星，伤害将会减轻。然而除了少数家庭以外，父母的地位将无法有所提升，命主的资产也将受到限制，既不富裕亦不贫穷。
If Jupiter was in the square of Venus, on her right side, it indicates that that native will be a lover of the people, and will benefit because of women, being good in esteem due to [his] livelihood, coming close to God, powerful in his oaths. And if Venus was looking down upon Jupiter, then evil will be spoken of him in his happiness, and a blemish will afflict him from his eagerness for women, loving praise, and pleasure and cleanliness will accompany him; but he will be afflicted in what he tries to do (of work), and through his own actions he will be seen as committing offense, and he will rejoice in whatever good comes to him due to evil, except that he will do evil.
若木星与金星四分，在金星的右方，命主将为热爱群众之人，因女性而得益，因富得贵，对主虔诚，重视承诺。若金星往下注视木星，则欢愉处将产生邪恶，爱好女色成为他的瑕疵，热爱他人的称赞，可享有快乐与清廉的声誉；但他（工作上）的作为仍会受到阻碍，他的行动容易被视为犯罪。即使不是为非作歹之人，仍能享受因邪恶之事所带来的利益。
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