al-Muqtadir

The One whose supreme power determines and delivers the suitable measure of all things. The One whose decisions always prevail. The One who has power and ability to ordain all things.

The One who is empowered to do whatever wisdom decides. The One who has the power and ability to decide the outcome of all matters.

The One whose power enforces all decrees and ordains the course of all affairs. The One whose decree prevails in every situation.

From the root q-d-r which has the following classical Arabic connotations:

to measure something, know the measure of something
to distribute, allot or apportion the suitable measure
to decree, to ordain, to decide a matter (as though measuring it to fit)
to exercise thought in preparing something, to make use of reason
to intend or determine something
to have the power to accomplish, to be rendered able
to be able to prevail, to be empowered

This name is used in the Qur'ān. For example, see 54:55

Qādir, from this same q-d-r root,  indicates the supreme ability to make a decree or ordain something, while Muqtadir points to the supreme power by which that decree is enacted.

That is, Muqtadir is an intensive form of the root q-d-r which emphasizes the use Supreme Power to actively enforce whatever Divine wisdom decides.

The Arabic prefix mu at the beginning of the word points toward the means by which something happens, or the embodiment of an action, leading to translations such as the one who is, or the one who does (similar to the suffix er in English).

Qādir is a less intensive form of the root q-d-r which describes the attribute of being able to decree, ordain, appoint or decide.

Related names:

Qawī - Strong - the One who is all-mighty and possesses inexhaustible strength.

Matīn - Firm - the One whose nature it is to be firm, determined and steadfast.

Qahhār - Dominator - the One who dominates, conquers, overpowers

Qādir - the One whose nature it is to decree, ordain, appoint, measure-out, decide.

Muqtadir - the One whose supreme power enforces whatever Divine wisdom decrees or decides; omnipotent, able to do everything.