What's the "een" in Halloween?
1610s, from Latin ingestionem (nominative ingestio) "a pouring in," noun of action from past participle stem of ingerere (see ingest).
ingestion in·ges·tion (ĭn-jěs'chən)
The act of taking food and drink into the body by the mouth.
The taking in of particles by a phagocytic cell.