[count] 1 : an official list, book, or system for keeping records of something — often + of ▪ The church keeps a register of births, marriages, and deaths. ▪ a national register of historic places ▪ a register [=(US) registry] of voters ▪ (Brit) After the students were seated, the teacher called/took the register. [=read a list of the students' names out loud and noted which students were there and which were not]2 formal : a part of the range of musical notes that a person's voice or an instrument can reach
▪ a singer's upper/middle/lower register3 : cash register
▪ She works at the register in a grocery store.4 US : a cover on an opening (such as a heating vent) that has parts which can be opened or closed to control the flow of air
▪ a singer's upper/middle/lower register
▪ She works at the register in a grocery store.