n. power, strength, ability

Wo lost fron wah ney dov, ahrk fin reyliik do jul, voth aan suleyk wah ronit faal krein!
Who was kin to both wyrm, and the races of man, with a power to rival the sun!
(Book, Songs of Skyrim)

Suleyki mulaag, Paarthurnax. My power has waxed, while yours has waned.
Suleyki mulaag = “my power (has) strengthened”
(Alduin, 00044968)

Zin krif horvut se suleyk.
Honor (is) fighting the lure of power.
(Paarthurnax, 0003C574)

In your tongue, [Yol] simply means “Fire.” It is change given form. Power at its most primal. That is the true meaning of “Yol.” Suleyk. Power. You have it, as do all dov. But power is inert without action and choice.
(Paarthurnax, 000E8275)

Naal Thu'umu, mu ofan nii nu, Dovahkiin, naal suleyk do Kaan, naal suleyk do Shor, ahrk naal suleyk do Atmorasewuth.
By our Voice we give it now (to you), Dragonborn, by (the) power of Kyne, by the power of Shor, and by the power of Atmora-of-old.
(Greybeards, 000C43A6)

The capacity to act; inborn strength, ability, typically related to the Thu’um. Inner power. Associated with domination. Usually only in reference to persons, or things characterized as having an inner power.

Possibly from su ‘air’, related to su’um ‘breath/inner spirit’.