The word "stadium invasionis" is not a commonly used term in English. However, if we examine its spelling using the International Phonetic Alphabet (IPA), we can see that it is pronounced as /steɪdiəm ɪnveɪʒənɪs/. This indicates that the word has five syllables, with the stress falling on the second syllable. The phonetic transcription also shows that the word contains a diphthong (ai) and a voiced fricative (ʒ), which can help learners improve their pronunciation skills. Overall, IPA is a useful tool for understanding and learning the spelling of unfamiliar words.
The prodromal or incubative stage of an infectious disease.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.