a speech defect consisting in pronouncing s and z like or nearly like the th- sounds of thin and this, respectively.
Phonetics. any unconventional articulation of the sibilants, as the pronunciation of s and z with the tongue between the teeth (lingual protrusion lisp) close to or touching the upper front teeth (dental lisp) or raised so that the breath is emitted laterally (lateral lisp)
the act, habit, or sound of lisping.
verb (used with object), verb (used without object)
to pronounce or speak with a lisp.
to speak imperfectly, especially in a childish manner.

before 1100; Middle English wlispen, lipsen, Old English āwlyspian; akin to Dutch lisp(el)en, German lispeln, Norwegian leipsa

lisper, noun
lispingly, adverb
unlisping, adjective Unabridged


noun Computers.
a high-level programming language that processes data in the form of lists: widely used in artificial intelligence applications.

lis(t) p(rocessing) Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
lisp (lɪsp)
1.  the articulation of s and z like or nearly like the th sounds in English thin and then respectively
2.  the habit or speech defect of pronouncing s and z in this manner
3.  the sound of a lisp in pronunciation
4.  to use a lisp in the pronunciation of (speech)
5.  to speak or pronounce imperfectly or haltingly
[Old English āwlispian, from wlisp lisping (adj), of imitative origin; related to Old High German lispen]
adj, —n

LISP (lɪsp)
a high-level computer-programming language suitable for work in artificial intelligence
[C20: from lis(t) p(rocessing)]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

late O.E. awlyspian, from wlisp (adj.) "lisping," probably of imitative origin (cf. M.Du., O.H.G. lispen, Dan. læspe, Swed. läspa). The noun is first attested 1625.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

lisp (lĭsp)
A speech defect or mannerism characterized by mispronunciation of the sounds (s) and (z) as (th) and (th). v. lisped, lisp·ing, lisps
To speak with a lisp.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Computing Dictionary

Lisp definition

LISt Processing language.
(Or mythically "Lots of Irritating Superfluous Parentheses"). Artificial Intelligence's mother tongue, a symbolic, functional, recursive language based on the ideas of lambda-calculus, variable-length lists and trees as fundamental data types and the interpretation of code as data and vice-versa.
Data objects in Lisp are lists and atoms. Lists may contain lists and atoms. Atoms are either numbers or symbols. Programs in Lisp are themselves lists of symbols which can be treated as data. Most implementations of Lisp allow functions with side-effects but there is a core of Lisp which is purely functional.
All Lisp functions and programs are expressions that return values; this, together with the high memory use of Lisp, gave rise to Alan Perlis's famous quip (itself a take on an Oscar Wilde quote) that "Lisp programmers know the value of everything and the cost of nothing".
The original version was LISP 1, invented by John McCarthy at MIT in the late 1950s. Lisp is actually older than any other high level language still in use except Fortran. Accordingly, it has undergone considerable change over the years. Modern variants are quite different in detail. The dominant HLL among hackers until the early 1980s, Lisp now shares the throne with C. See languages of choice.
One significant application for Lisp has been as a proof by example that most newer languages, such as COBOL and Ada, are full of unnecessary crocks. When the Right Thing has already been done once, there is no justification for bogosity in newer languages.
See also Association of Lisp Users, Common Lisp, Franz Lisp, MacLisp, Portable Standard Lisp, Interlisp, Scheme, ELisp, Kamin's interpreters.
[Jargon File]
The Free On-line Dictionary of Computing, © Denis Howe 2010
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American Heritage
Abbreviations & Acronyms
List Processing computer language
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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