أُصُولٌ foundations in Arabic
أُصُولٌ is how you say “foundations” in Arabic.
Arabic
English
The audio uses AI voices.
Example sentence
وألحقوه بأصول الفقه في الدين،
And they attached it to the foundations of jurisprudence in religion.
بِأُصُولِ to the foundations
'to the foundations of' — here 'bi' marks what they joined it TO; genitive, head of an 'of' pairing with 'fiqh'; broken plural of 'asl'.
The English is machine-translated.

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More example sentences
أصول الدين هو اسم عظيم،
'The Fundamentals of Religion' is a great name,
أُصُولُ fundamentals
This is a broken plural ('roots / foundations'), reshaped from its singular, and it heads a possessive pairing — 'the foundations OF religion'. It is the nominative subject of a verbless sentence. As the first term of the chain it gives up any 'the' of its own and takes its definiteness from the owner that follows.
فهما أصول دين الإسلام، ليس إلا،
For they are the fundamentals of the religion of Islam, nothing else.
أُصُولُ the fundamentals
This is the predicate, a broken plural heading a possessive ('the foundations of...'). It is nominative as the comment of the sentence. As a construct head it drops its own 'the' and leans on the owner that follows for definiteness.
فأصول دين السلف الإيمان بالله وكتبه ورسله وملائكته،
The fundamentals of the religion of the predecessors were faith in Allah, His books, His messengers, His angels,
فَأُصُولُ so the fundamentals
This is 'so' plus a broken plural heading a possessive — 'so the foundations of...'. It is the nominative subject (topic). As a construct head it drops its own 'the' and draws definiteness from the chain of owners that follows.
والترضي عن كل الصحابة، إلى غير ذلك من أصول السنة،
and to be pleased with all the companions, among other fundamentals of the Sunnah,
أُصُولِ fundamentals
Genitive after 'among', this broken plural ('foundations') heads a possessive — 'the foundations OF the Sunnah'. So it is both object of the partitive and owner of the noun to come. It rounds the list back to its heading.
وأصول دين الخلف هو ما صنفوا فيه،
The fundamentals of the religion of the later generations are what they compiled,
وَأُصُولُ the fundamentals
This is 'and' plus a broken plural heading a possessive — 'and the foundations of...'. It is the nominative subject of the new sentence. As construct head it drops its own 'the' and takes definiteness from the chain that follows.