Open: N. Abbreviation For `open (or Left) Parenthesis' --- Used When Necessary To Eliminate Oral Ambiguity.

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:open: n. Abbreviation for `open (or left) parenthesis' --- used when
necessary to eliminate oral ambiguity. To read aloud the LISP form
(DEFUN FOO (X) (PLUS X 1)) one might say: "Open defun foo, open
eks close, open, plus eks one, close close."
-- The AI Hackers Dictionary

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