Correct spelling for the English word "AASTOIS" is [ˈɑːstwɑː], [ˈɑːstwɑː], [ˈɑː_s_t_w_ɑː] (IPA phonetic alphabet).
AASTOIS is not a recognized word in the English language. Therefore, it does not have a standard dictionary definition. There is a possibility that it is a typo or an acronym specific to a certain field or industry.
If it is a typo, it may have been intended to be another word. Without further context, it is difficult to determine the correct word that could have been meant.
If AASTOIS is an acronym, it is important to know the field or industry it is related to in order to provide an accurate definition. Acronyms can have multiple meanings depending on the context. For example, AASTOIS could represent "American Association of State Transportation Officials Information System" or "Automated Analysis of Secure Transport Operation and Intrusion Sensing." These are fictional examples without knowledge of the actual field.
If you could provide additional information or clarification regarding the intended word or meaning, it would be easier to provide a more accurate definition.