lə mɛrɪˈdiən
Here's a breakdown:
* lə: like the "le" in "let"
* mɛrɪ: like "merry" but with a slightly shorter "e" sound
* ˈdiən: like "dee-en"
It's important to remember that the "i" in "Méridien" is pronounced like the "i" in "machine," not like the "i" in "sit."