Admission means (1) the act of allowing to enter, (2) the right to enter, (3) the price required to enter, and (4) an acknowledgment of truth. The word is often figurative; for example, you might gain admission to a college or club without physically entering it. Admittance refers to the act of physically entering. Though you might gain admission to a college months before the school year starts, admittance doesn’t happen until you actually get there.
A much cited study finds that caste-based reservation reduced the overall number of women gaining admission into engineering colleges. [Wall Street Journal]
He was refused admittance by the guards because he was not registered as living in Klein-Glienicke. [BBC News]
Admission will remain free for children 16 and under. [New York Times]
Although the show is free, tickets are required for admittance to this event. [Star-Ledger]
By the government’s own admission, a once-great manufacturing tradition, vastly diminished from its heyday, would be in terminal decline. [Guardian]