Noun admittance has 2 senses
  1. entree, access, accession, admittance - the right to enter
    --1 is a kind of right
    --1 has particulars: door
    Derived form: verb admit3
  2. admission, admittance - the act of admitting someone to enter; "the surgery was performed on his second admission to the clinic"
    --2 is a kind of entrance, entering, entry, ingress, incoming
    --2 has particulars: readmission; matriculation, matric