why the or no the?

0Hi,02br
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00Please take a look at the sentence below.02br
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01i00This book challenges 01u00the conventional definition02u00 of worship.02i02br
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00Here, the word 'definition' seems to be preceded by 'the' because it is not just any definition but a definition of the word 'worship'.02br
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00If I replace the words 'conventional definition' with 'freedom', it seems to be OK without any article. I do admit that it seems that 'definition' is countable and 'freedom' is variable in their grammartical nature.02br
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01i00This book challenges 01u00freedom02u00 of worship 02i02br
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00Why some nouns can do away with the articles when they are in almost the same sentential structure? The first sentence requires an article, whereas the second one can do away with it. Why is that? 02br
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00Is it that I think what Mr. M seems to have said in another thread (in what seems to be a similar line of question) that semantic meaning of a word is more important than the context or the intent of a writer? 0-