Princeton's WordNet

1. lisp(noun)

   a speech defect that involves pronouncing `s' like voiceless `th' and `z' like voiced `th'

2. LISP, list-processing language(verb)

   a flexible procedure-oriented programing language that manipulates symbols in the form of lists

3. lisp(verb)

   speak with a lisp

Wiktionary

1. lisp(Noun)

   The habit or an act of lisping.

2. lisp(Verb)

   To pronounce the sibilant letter u2018su2019 imperfectly; to give u2018su2019 and u2018zu2019 the sounds of u2018thu2019 (/u03B8 / u00F0/) u2014 a defect common amongst children.

3. lisp(Verb)

   To speak with imperfect articulation; to mispronounce, as a child learning to talk.

4. lisp(Verb)

   To speak hesitatingly and with a low voice, as if afraid.

5. lisp(Verb)

   To pronounce with a lisp.

6. lisp(Verb)

   To utter with imperfect articulation; to express with words pronounced imperfectly or indistinctly, as a child speaks; hence, to express by the use of simple, childlike language.

7. lisp(Verb)

   To speak with reserve or concealment; to utter timidly or confidentially; as, to lisp treason.

8. Lisp(ProperNoun)

   A functional programming language with a distinctive parenthesized syntax, much used in artificial intelligence.

Origin: Contraction of list processing.

Webster Dictionary

1. Lisp(verb)

   to pronounce the sibilant letter s imperfectly; to give s and z the sound of th; -- a defect common among children

2. Lisp(verb)

   to speak with imperfect articulation; to mispronounce, as a child learning to talk

3. Lisp(verb)

   to speak hesitatingly with a low voice, as if afraid

4. Lisp(verb)

   to pronounce with a lisp

5. Lisp(verb)

   to utter with imperfect articulation; to express with words pronounced imperfectly or indistinctly, as a child speaks; hence, to express by the use of simple, childlike language

6. Lisp(verb)

   to speak with reserve or concealment; to utter timidly or confidentially; as, to lisp treason

7. Lisp(noun)

   the habit or act of lisping. See Lisp, v. i., 1

The New Hacker's Dictionary

1. LISP

   [from ‘LISt Processing language’, but mythically from ‘Lots of Irritating Superfluous Parentheses’] AI's mother tongue, a language based on the ideas of (a) variable-length lists and trees as fundamental data types, and (b) the interpretation of code as data and vice-versa. Invented by John McCarthy at MIT in the late 1950s, it is actually older than any other HLL still in use except FORTRAN. Accordingly, it has undergone considerable adaptive radiation over the years; modern variants are quite different in detail from the original LISP 1.5. The dominant HLL among hackers until the early 1980s, LISP has since shared the throne with C. Its partisans claim it is the only language that is truly beautiful. See languages of choice.All LISP functions and programs are expressions that return values; this, together with the high memory utilization of LISPs, 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”.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

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