Permission to go into a place — the door, the building, the grounds. Signs still say “No admittance,” meaning you may not enter.

Permission to go into a place進入一個地方的許可 — the door門口、 the building建築物、 the grounds或整個場地。Signs still say告示牌上還是會寫 "No admittance,"「No admittance」， meaning you may not enter意思是不准進入。

It is a slightly old-fashioned or official noun; in everyday talk people more often say you can’t come in, or they use admission. Though actually, admission and admittance are cousins that even native speakers mix up: admittance leans toward physically entering a place; admission is the wider word — tickets, being accepted into a school, or admitting a mistake.

It is a slightly old-fashioned or official noun這是稍微老派或正式的名詞； in everyday talk people more often say日常說話比較常說 you can't come inyou can't come in， or they use admission或用admission這個字。Though actually不過， admission and admittance are cousins that even native speakers mix upadmission和admittance其實是連母語者都會搞混的近親詞： admittance leans toward physically entering a placeadmittance比較偏向實際走進一個地方； admission is the wider wordadmission則是比較廣的字 — tickets門票、 being accepted into a school被學校錄取、 or admitting a mistake或是承認錯誤都可以用。

Engineers later used admittance for a technical idea about electric current (a sense coined in 1887), but that is specialist talk. For most learners, the door-sign meaning is the one that matters.

Engineers later used admittance for a technical idea about electric current工程師後來用admittance來指一個跟電流有關的技術概念 (a sense coined in 1887)（這個意思是1887年創造的）， but that is specialist talk但那是專業術語。For most learners對大部分學習者來說， the door-sign meaning is the one that matters門口告示牌那個意思才是重要的。