The word(s) "fixed" appears 28 time(s) in 27 verse(s) in Quran in Mohsin Khan translation.

(21) He has created the heavens and the earth with truth. He makes the night to go in the day and makes the day to go in the night. And He has subjected the sun and the moon. Each running (on a fixed course) for an appointed term. Verily, He is the All-Mighty, the Oft-Forgiving.

(22) The sun and the moon run on their fixed courses (exactly) calculated with measured out stages for each (for reckoning).

(23) And We have set none but angels as guardians of the Fire. And We have fixed their number (19) only as a trial for the disbelievers, in order that the people of the Scripture (Jews and Christians) may arrive at a certainty [that this Qur'an is the truth as it agrees with their Books regarding the number (19) which is written in the Taurat (Torah) and the Injeel (Gospel)] and that the believers may increase in Faith (as this Qur'an is the truth), and that no doubt may be left for the people of the Scripture and the believers, and that those in whose hearts is a disease (of hypocrisy) and the disbelievers may say: "What Allah intends by this (curious) example ?" Thus Allah leads astray whom He wills and guides whom He wills. And none can know the hosts of your Lord but He. And this (Hell) is nothing else than a (warning) reminder to mankind.

(24) Verily, the Day of Decision is a fixed time,

(25) And the mountains He has fixed firmly,

(26) And at the mountains, how they are rooted (and fixed firm)?

(27) Those who delay their Salat (prayer from their stated fixed times).