means To register is to formally record or enroll something in an official list; as a noun, it's that record itself, a range (of voice, of style), or the machine that tallies sales.

from From Latin 'regesta,' meaning 'things recorded,' from 'regerere' — to carry back, to bring together — built from 're-' (back) and 'gerere' (to carry, to bear). The word entered English through Old French 'registre' in the late Middle Ages, naming the bound book where names and dealings were written down. The 'cash register' sense is a much later twist, when the recording-book became a recording-machine.