register

1 register /ˈrɛʤəstɚ/ noun
plural registers
1 register
/ˈrɛʤəstɚ/
noun
plural registers
Britannica Dictionary definition of REGISTER
[count]
1 
: an official list, book, or system for keeping records of something — often + of
2 
formal : a part of the range of musical notes that a person's voice or an instrument can reach
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
2 register /ˈrɛʤəstɚ/ verb
registers; registered; registering
2 register
/ˈrɛʤəstɚ/
verb
registers; registered; registering
Britannica Dictionary definition of REGISTER
1 
a  [+ object] : to record information about (something) in a book or system of public records
b  : to put your name on an official list
[no object]
— often + at or for
[+ object]
— see also preregister
◊ If you register as something or if you are registered as something, you enter or have entered your name on an official list which indicates what group you belong to.
2 
[+ object] : to show or record (an amount, value, etc.)
3 
[+ object] : to get or reach (something) : achieve
4 
a  [no object] : to be recognized or remembered
— often used in negative statements
b  [+ object] : to notice or realize (something) — often used in negative statements
5 
formal : to show (a feeling or emotion)
[+ object]
[no object]
6 
[+ object] : to send (a letter, package, etc.) by registered mail to protect it from damage or loss
7 
[+ object] formal : to make (something) known officially and publicly