IPA: /ˌɪn.dɪˈsəʊ.ʃə.bəl/
KK: /ɪnˈdɪsəʊʃəbl/
Something that cannot be separated or divided from something else.
The two concepts are indissociable, meaning they are always connected.
Indissociable is formed from "in-" (meaning not) and "dissociable" (from Latin "dissociabilis", meaning separable). The word describes something that cannot be separated or divided.
Think of 'not' ('in-') being able to 'separate' ('dissociable') — that's why indissociable means something that cannot be separated.