elision
Elision (noun) means the act of leaving something out on purpose.
Etymology
Came from Latin ēlīsiō (“striking out, forcing out”) — the source of -ion (“noun suffix denoting action, result, process, state, condition”) — from ēlīsus (“knocked out, forced out”), the past participle of ēlīdō (“to knock, dash or strike out”), which gives elide, from ex- (“out, away”) and laedō (“to strike, collide, hurt”), which gives e- (“assimilated form of ex-”).