Comment by kelas

> seems to disagree

no, actually i think Wikipedia got it right:

  "The 1974 Maclisp reference manual by David A. Moon attests "Read-eval-print loop" on page 89, but does not use the acronym REPL.[7]
  Since at least the 1980s, the abbreviations REP Loop and REPL are attested in the context of Scheme.[8][9]"

The first APL interpreter was implemented on System/360 in 1965. Iverson got a Turing in 1979.