The correct spelling of the word "in excitabilities" can be explained using IPA phonetic transcription. The first syllable "in" is pronounced as /ɪn/ and means not or without. The second syllable "ex" is pronounced as /ɛks/ and means out of or beyond. The third syllable "cit" is pronounced as /sɪt/ and means to arouse or stimulate. The fourth syllable "a" is pronounced as /ə/ and is a neutral vowel sound. The fifth syllable "bil" is pronounced as /bɪl/ and means inclined to or characterized by. The sixth syllable "i" is pronounced as /ɪ/ and means the state or condition of. Finally, the seventh syllable "ties" is pronounced as /tiz/ and means the plural of "ty" which means quality or state.