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
De-ten-tion 3 syllables
You can divide it into syllables as such: "Prac-ti-tion" therefore it has 3 syllables.
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yes it can be divide in three syllables and when your chin goes down there is a syllables.
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