first try to pronounce the word. You will find that there are places or rather syllables where you stress the most. In this case the stress would be on the 'd' the 't' and the 'ti' pronounced as 'sh'. The syllables would be de.ten.tion. You can refer to the dictionary for more information on stress and syllables.
De-ten-tion 3 syllables
There are two syllables divided like so: di-vide.
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