A surname.

A formal recording of names, events, transactions, etc. / A book of such entries. / An entry in such a book. / The act of registering.

simple past tense and past participle of register

Having had one's name added to an official list or entered into a register

plural of register

Third-person singular simple present indicative form of register

present participle of register

to record your name on an official list; sign up

(programming) A variable whose value is stored directly in a register for faster access.

plural of register variable