IPA: /ɪkˈsɜːrpʃən/
KK: /ɛkˈsɜrʃən/
A part or piece taken from a larger text or work, often used to highlight important information or ideas.
The teacher provided an excerption from the novel to illustrate the main theme.
Excerption is formed from "ex-" (meaning out of) and "capere" (meaning to seize or take). The word refers to the act of taking out a portion or extract from a larger text or work.
Think of 'taking out' ('ex-') a part from something larger ('capere') — that's what excerption means.