Definition of "REM"

REM¹

noun
countable and uncountable, plural REMs
1. Initialism of rapid eye movement.

REM²

noun
uncountable
1. (music) Initialism of remaining time.
noun
plural REMs
1. (computing) A remark (programming language statement used for documentation).
  Quotations
  I think it should be upgraded to Visual BASIC, but I'm no good at that. So maybe someone here would like to take a crack at it. There are only 40 lines of active code, plus a few REMs. About 100 BASIC commands altogether.
  2006 December 24, David Williams, “satellite program”, in comp.lang.basic.visual.misc‎ (Usenet)

REM³

noun
uncountable
1. (chemistry) Abbreviation of rare earth metal..
noun
plural REMs
1. Abbreviation of reactive electrochemical membrane.