to enter one's name in a list of an institute, school, etc.

enroll to vote

be aware of

indicate a certain reading; of gauges and instruments

have one's name listed as a candidate for several parties

enter into someone's consciousness

send by registered mail

manipulate the registers of an organ

show in one's face

to express one’s opinions in an official or public manner

an official written record of names or events or transactions

a vent or grille that allows heated air to flow into a room or space from the ductwork

an air passage (usually in the floor or a wall of a room) for admitting or excluding heated air from the room

(computer science) memory device that is the part of computer memory that has a specific address and that is used to hold information of a specific kind

a formal record or log where specific information, such as names, dates, or transactions, is systematically recorded

(linguistics) a variety of language that is used in a particular social context, based on the communicative purpose and social status of the user