IPA: /ɪnˈsoʊmʌtʃ/
KK: /ɪnˈsoʊmʌtʃ/
For that reason; to that extent; as a result of something previously mentioned.
She was very tired, insomuch that she fell asleep during the movie.
Insomuch is formed from "in-" (meaning not) and "so much" (meaning to such an extent). The word refers to a degree or extent that is not limited, often used to indicate a strong connection or consequence.
Think of 'not limited' ('in-') to 'such an extent' — this helps you remember that insomuch refers to a degree that is significant or considerable.