The spelling of the word "spoused" is based on the phonetic transcription of its pronunciation. In IPA (International Phonetic Alphabet), the word is pronounced /spaʊzd/. It is the past participle form of the verb "spouse," meaning "to marry." The letter "e" is added to the end of the word to indicate that it is the past participle form. The phonetic transcription sheds light on the spelling of the word and how it is pronounced in speech.