يَوْمًا one day in Arabic
يَوْمًا is how you say “one day” in Arabic.
Arabic
English
The audio uses AI voices.
Example sentence
فَشَرِبْتُ يَوْمًا عِنْدَ خِدْنِ لَيِّ حَتَّى ثَمِلْتُ وَزَالَ عَقْلِي،
One day I drank at a man's house until I became intoxicated and my mind left me.
يومًا one day
A noun for 'day' standing in the adverb-of-time slot, marked by the indefinite accusative ending ('-an'). Arabic does not need a preposition like 'on' here; dropping a time-noun into the accusative is itself the way to say 'one day, at some point', so the case ending alone carries the 'when'.
The English is machine-translated.

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More example sentences
فَنَأَى بِي فِي طَلَبِ شَيْءٍ يَوْمًا،
Then he went away from me one day to look for something.
يَوْمًا one day
A noun used as a time-adverb, taking the object-style ending that marks when the action happened. It pins the going to a single particular day, working adverbially rather than as a thing acted on.
اَلْيَوْمُ يَوْمُ الْمَلْحَمَةِ، اَلْيَوْمَ تُسْتَحَلُّ الْكَعْبَةُ
Today is the day of the great battle; today the Kaaba will be desecrated.
اَلْيَوْمَ today
The same word 'the day' but here in its object case ('-a'), used adverbially to mean 'today / on this day'. Arabic can turn a time-noun into a 'when' adverb just by putting it in the object case, with no preposition needed.
فَبَيْنَا نَحْنُ يَوْمًا جُلُوسٌ فِي بَيْتِنَا
One day, while we were sitting in our house.
يَوْمًا one day
A noun used adverbially to fix the time, 'one day'; its -an accusative is what turns it into a when-phrase rather than a plain object. It plants the scene on a particular day, with no separate word for 'on'.
فَنَزَلَ يَوْمًا مَنْزِلًا فَدَخَلَ الْأَرَاكَ،
One day he stopped at a lodging, and then he entered the thickets.
يَوْمًا one day
A time-noun in the adverb ending (the '-an' tail) meaning 'one day'; it answers 'when?' for the halting and needs no preposition, since the ending alone carries the time-of-action role.
وَلَقَدْ قَعَدْتُ يَوْمًا عَلَى طَرِيقِهِمْ الَّذِي يَخْرُجُونَ مِنْهُ،
And indeed, one day I sat on their road, the road they used to go out from,
يَوْمًا one day
This noun for 'day' stands in the object form even though it is not an object; Arabic puts a time word into that case to make it adverbial, meaning 'on/for a day'. Its lack of 'the' marks it as 'one (unspecified) day'. This is how Arabic says 'one day' without a preposition.
فَلَعِبَ يَوْمًا بِالنَّرْدِ عَلَى أَنَّ مَنْ قَمَرَ صَاحِبَهُ
So one day he played dice, betting that whoever was his companion's moon.
يَوْمًا one day
A noun put into the accusative (marked by the '-an' tail) so that it works as a time-adverb, 'one day'. Arabic does not need a preposition like 'on' here; dropping the noun into this case is itself enough to make it answer 'when'. The indefinite ending also gives the sense of 'a certain day'.