Erpri: /ter'pree/ [from LISP 1.5 (and Later, MacLISP)] Vi.

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:terpri: /ter'pree/ [from LISP 1.5 (and later, MacLISP)] vi. To
output a {newline}. Now rare as jargon, though still used as
techspeak in Common LISP. It is a contraction of `TERminate PRInt
line', named for the fact that, on some early OSes and hardware, no
characters would be printed until a complete line was formed, so
this operation terminated the line and emitted the output.
-- The AI Hackers Dictionary

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