Other forms: admissions
Admission is being let in, or the confession of a fact. Free admission, an admission of guilt, hospital admissions.
The two senses share the idea of letting something in — a door or a truth. In law an admission is a statement against your own interest, which is why it carries so much weight in evidence. Admissions in a hospital are counted as a measure of pressure.
Latin admissio comes from admittere, to let in — ad plus mittere, to send. Admit is the same verb.
Latin
admissio
English, today
admission
Borrowed from Latin admissio; compare French admission. See admit.
Etymology from Wiktionary, CC BY-SA