The word(s) "join" appears 84 time(s) in 80 verse(s) in Quran in Mohsin Khan translation.

(41) And those who joined others in worship with Allah said: "If Allah had so willed, neither we nor our fathers would have worshipped aught but Him, nor would we have forbidden anything without (Command from) Him." So did those before them. Then! Are the Messengers charged with anything but to convey clearly the Message?

(42) Verily, Allah enjoins Al-'Adl (i.e. justice and worshipping none but Allah Alone - Islamic Monotheism) and Al-Ihsan [i.e. to be patient in performing your duties to Allah, totally for Allah's sake and in accordance with the Sunnah (legal ways) of the Prophet صلى الله عليه وسلم in a perfect manner], and giving (help) to kith and kin (i.e. all that Allah has ordered you to give them e.g., wealth, visiting, looking after them, or any other kind of help), and forbids Al-Fahsha' (i.e all evil deeds, e.g. illegal sexual acts, disobedience of parents, polytheism, to tell lies, to give false witness, to kill a life without right), and Al-Munkar (i.e all that is prohibited by Islamic law: polytheism of every kind, disbelief and every kind of evil deeds), and Al-Baghy (i.e. all kinds of oppression). He admonishes you, that you may take heed.

(43) His power is only over those who obey and follow him (Satan), and those who join partners with Him (Allah i.e. those who are Mushrikun i.e. polytheists. See Verse 6:121).

(44) Verily, Ibrahim (Abraham) was an Ummah (a leader having all the good righteous qualities), or a nation, obedient to Allah, Hanif (i.e. to worship none but Allah), and he was not one of those who were Al-Mushrikun (polytheists, idolaters, disbelievers in the Oneness of Allah, and those who joined partners with Allah).

(45) "And He has made me blessed wheresoever I be, and has enjoined on me Salat (prayer), and Zakat, as long as I live."

(46) And he used to enjoin on his family and his people As-Salat (the prayers) and the Zakat and his Lord was pleased with him.

(47) And enjoin As-Salat (the prayer) on your family, and be patient in offering them [i.e. the Salat (prayers)]. We ask not of you a provision (i.e. to give Us something: money): We provide for you. And the good end (i.e. Paradise) is for the Muttaqun (the pious - See V.2:2).

(48) Have not those who disbelieve known that the heavens and the earth were joined together as one united piece, then We parted them? And We have made from water every living thing. Will they not then believe?

(49) Those (Muslim rulers) who, if We give them power in the land, (they) enjoin Iqamat-as-Salat [i.e. to perform the five compulsory congregational Salat (prayers) (the males in mosques)], to pay the Zakat and they enjoin Al-Ma'ruf (i.e. Islamic Monotheism and all that Islam orders one to do), and forbid Al-Munkar (i.e. disbelief, polytheism and all that Islam has forbidden) [i.e. they make the Qur'an as the law of their country in all the spheres of life]. And with Allah rests the end of (all) matters (of creatures).

(50) And when you have embarked on the ship, you and whoever is with you, then say: "All the praises and thanks be to Allah, Who has saved us from the people who are Zalimun (i.e. oppressors, wrong-doers, polytheists, those who join others in worship with Allah).