say it: in-SUR-shuhn
insertion is a noun meaning "a message (spoken or written) that is introduced or inserted". It carries 2 recorded senses.
a message (spoken or written) that is introduced or inserted
“with the help of his friend's interpolations his story was eventually told”
“with many insertions in the margins”
the act of putting one thing into another
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for insertion come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.