The spelling of the word "ex postulates" is derived from its Latin origins. "Ex" means "out of," while "postulates" refers to a statement or proposition that is accepted as true without proof. In IPA phonetic transcription, the word is pronounced as "eks-pɒstjʊleɪts." The "x" is pronounced as "ks," and the stress is on the second syllable. As with many Latin-based words, the spelling can appear challenging, but a basic understanding of the language roots can make it more manageable.