The word(s) "solemn" appears 11 time(s) in 10 verse(s) in Quran in Abdullah Yusuf Ali translation.

(1) And remember We took your covenant (to this effect): Shed no blood amongst you, nor turn out your own people from your homes: and this ye solemnly ratified, and to this ye can bear witness.

(2) When ye divorce women, and they fulfil the term of their ('Iddat), either take them back on equitable terms or set them free on equitable terms; but do not take them back to injure them, (or) to take undue advantage; if any one does that; He wrongs his own soul. Do not treat Allah's Signs as a jest, but solemnly rehearse Allah's favours on you, and the fact that He sent down to you the Book and Wisdom, for your instruction. And fear Allah, and know that Allah is well acquainted with all things.

(3) And how could ye take it when ye have gone in unto each other, and they have Taken from you a solemn covenant?

(4) And for their covenant we raised over them (the towering height) of Mount (Sinai); and (on another occasion) we said: "Enter the gate with humility"; and (once again) we commanded them: "Transgress not in the matter of the sabbath." And we took from them a solemn covenant.

(5) Said Jesus the son of Mary: "O Allah our Lord! Send us from heaven a table set (with viands), that there may be for us - for the first and the last of us - a solemn festival and a sign from thee; and provide for our sustenance, for thou art the best Sustainer (of our needs)."

(6) (Jacob) said: "Never will I send him with you until ye swear a solemn oath to me, in Allah's name, that ye will be sure to bring him back to me unless ye are yourselves hemmed in (and made powerless). And when they had sworn their solemn oath, he said: "Over all that we say, be Allah the witness and guardian!"

(7) And for those who launch a charge against their spouses, and have (in support) no evidence but their own,- their solitary evidence (can be received) if they bear witness four times (with an oath) by Allah that they are solemnly telling the truth;

(8) And the fifth (oath) (should be) that they solemnly invoke the curse of Allah on themselves if they tell a lie.

(9) And the fifth (oath) should be that she solemnly invokes the wrath of Allah on herself if (her accuser) is telling the truth.

(10) And remember We took from the prophets their covenant: As (We did) from thee: from Noah, Abraham, Moses, and Jesus the son of Mary: We took from them a solemn covenant: