The word(s) "monotheism" appears 283 time(s) in 267 verse(s) in Quran in Mohsin Khan translation.

(121) "No reward do I ask of you for it (my Message of Islamic monotheism); my reward is only from the Lord of the 'Alamin (mankind, jinn and all that exists).

(122) "No reward do I ask of you for it (my Message of Islamic monotheism); my reward is only from the Lord of the 'Alamin (mankind, jinn and all that exists).

(123) Except those who believe (in the Oneness of Allah - Islamic monotheism) and do righteous deeds, and remember Allah much, and vindicate themselves after they have been wronged [by replying back in poetry to the unjust poetry (which the pagan poets utter against the Muslims)]. And those who do wrong will come to know by what overturning they will be overturned.

(124) A guide (to the Right Path) and glad tidings for the believers [who believe in the Oneness of Allah (i.e. Islamic monotheism)].

(125) And they belied them (those Ayat) wrongfully and arrogantly, though their ownselves were convinced thereof [i.e. those (Ayat ) are from Allah, and Musa (Moses) is the Messenger of Allah in truth, but they disliked to obey Musa (Moses), and hated to believe in his Message of monotheism]. So see what was the end of the Mufsidun (disbelievers, disobedient to Allah, evil-doers and liars.).

(126) And when he attained his full strength, and was perfect (in manhood), We bestowed on him Hukm (Prophethood and right judgement of the affairs) and religious knowledge [of the religion of his forefathers i.e. Islamic monotheism]. And thus do We reward the Muhsinun (i.e. good doers. See the footnote of V.9:120).

(127) But if they answer you not (i.e. do not bring the Book nor believe in your doctrine of Islamic monotheism), then know that they only follow their own lusts. And who is more astray than one who follows his own lusts, without guidance from Allah? Verily Allah guides not the people who are Zalimun (wrong-doers, disobedient to Allah, and polytheists).

(128) Whosoever brings good (Islamic monotheism along with righteous deeds), he shall have the better thereof; and whosoever brings evil (polytheism along with evil deeds), then those who do evil deeds will only be requited for what they used to do.

(129) Those who believe [in the Oneness of Allah (monotheism) and in Messenger Muhammad صلى الله عليه وسلم , and do not give up their faith because of the harm they receive from the polytheists], and do righteous good deeds, surely, We shall expiate from them their evil deeds and shall reward them according to the best of that which they used to do.

(130) And indeed We sent Nuh (Noah) to his people, and he stayed among them a thousand years less fifty years [inviting them to believe in the Oneness of Allah (monotheism), and discard the false gods and other deities]; and the Deluge overtook them while they were Zalimun (wrong-doers, polytheists, disbelievers).