B1 [ I or T ] to put information, especially your name, into an official list or record（尤指把姓名）登记，注册，记录

C2 [ I or T ] to record, show, or express something显示；指示；表达

[ I or T ] informal If something registers, someone realizes it and if someone registers something, they realize it.（事物）受到注意，被意识到；（人）注意到，意识到

[ T ] If you register a letter or parcel, you send it using a special postal service, so that it will be dealt with in a special way and not be lost.挂号邮寄

[ C ] a book or record containing a list of names花名册；登记簿；注册表

[ C ] a book used to record if a child is present at school学校点名册

[ U ] in school, the period at the start of the morning and afternoon when a teacher records on an official list that children are present（老师在上、下午开始时对学生的）点名登记

C1 [ C or U ] specialized language the style of language, grammar, and words used for particular situations语域，语体风格

[ C ] all the notes that a musical instrument or a person's voice can produce, from the highest to the lowest（乐器或人的）音区，声区

[ C ] mainly US UK usually till the drawer in a cash register (= a machine which records sales in a shop, and in which money is kept) or the cash register itself收款机