IPA: /ˌɪntəˌlaɪˈneɪʃən/
KK: /ˌɪntərˌlaɪˈneɪʃən/
A note or comment written in the spaces between the lines of a text, often used to clarify or add information.
The teacher added an interlineation to the student's essay to provide feedback.
Interlineation → It is formed from "inter-" (meaning between) and "linea" (meaning line) and the suffix "-tion" (indicating the action or process). The word refers to the action of writing between the lines of a text.
Think of writing something 'between' ('inter-') the 'lines' ('linea') of a document — that's what interlineation means.