Correct spelling for the English word "ACTIHA" is [ˈaktɪhə], [ˈaktɪhə], [ˈa_k_t_ɪ_h_ə] (IPA phonetic alphabet).
I apologize, but I couldn't find any information or dictionary definition for the term "ACTIHA." It is possible that it is a specialized term, acronym, or a unique term specific to a certain context or field. Without further context or information, it is challenging to provide an accurate definition for the term.
If "ACTIHA" is a term you are familiar with and can provide appropriate context or additional information, I would be more than happy to assist you in defining it.