The word "in compactnesses" can be tricky to spell due to the multiple consonant clusters. In phonetic transcription, it is /ɪn kəmˈpækt nəsɪz/. The "n" sound before "c" and "p" may seem redundant, but it helps to break up the syllables and make the word easier to pronounce. The double "s" is also required to indicate the plural form of "compactness." This word is commonly used in mathematics and science domains to describe the degree of density or closeness.