Nonsense is a form of communication, via speech, writing, or any other formal logic system, that lacks any coherent meaning. In ordinary usage, nonsense is sometimes synonymous with absurdity or the ridiculous. Many poets, novelists and songwriters have used nonsense in their works, often creating entire works using it for reasons ranging from pure comic amusement or satire, to illustrating a point about language or reasoning. In the philosophy of language and philosophy of science, nonsense is distinguished from sense or meaningfulness, and attempts have been made to come up with a coherent and consistent method of distinguishing sense from nonsense. It is also an important field of study in cryptography regarding separating a signal from noise.
Literary
The phrase "Colorless green ideas sleep furiously" was coined by Noam Chomsky as an example of nonsense. The individual words make sense and are arranged according to proper grammatical rules, yet the result is nonsense. The inspiration for this attempt at creating verbal nonsense came from the idea of contradiction and seemingly irrelevant and/or incompatible characteristics, which conspire to make the phrase meaningless, but are open to interpretation. The phrase "the square root of Tuesday" operates on the latter principle. This principle is behind the inscrutability of the kōan "What is the sound of one hand clapping?", where one hand would presumably be insufficient for clapping.
Verse Jabberwocky, a poem (of nonsense verse) found in Through the Looking-Glass, and What Alice Found There by Lewis Carroll (1871), is a nonsense poem written in the English language. The word jabberwocky is also occasionally used as a synonym of nonsense.
Nonsense verse is the verse form of literary nonsense, a genre that can manifest in many other ways. Its best-known exponent is Edward Lear, author of The Owl and the Pussycat and hundreds of limericks. Nonsense verse is part of a long line of tradition predating Lear: the nursery rhyme Hey Diddle Diddle could also be termed a nonsense verse. There are also some works which appear to be nonsense verse, but actually are not, such as the popular 1940s song Mairzy Doats. Lewis Carroll, seeking a nonsense riddle, once posed the question How is a raven like a writing desk?. Someone answered him, Because Poe wrote on both. However, there are other possible answers (e.g. both have inky quills).
Examples The first verse of Jabberwocky by Lewis Carroll;
The first four lines of On the Ning Nang Nong by Spike Milligan;
The first verse of Spirk Troll-Derisive by James Whitcomb Riley;
The first four lines of The Mayor of Scuttleton by Mary Mapes Dodge;
Oh Freddled Gruntbuggly by Prostetnic Vogon Jeltz; a creation of Douglas Adams
Philosophy of language and of science
In the philosophy of language and the philosophy of science, nonsense refers to a lack of sense or meaning. Different technical definitions of meaning delineate sense from nonsense.
Logical positivism
Wittgenstein
In Ludwig Wittgenstein's writings, the word "nonsense" carries a special technical meaning which differs significantly from the normal use of the word. In this sense, "nonsense" does not refer to meaningless gibberish, but rather to the lack of sense in the context of sense and reference. In this context, logical tautologies, and purely mathematical propositions may be regarded as "nonsense". For example, "1+1=2" is a nonsensical proposition. Wittgenstein wrote in Tractatus Logico Philosophicus that some of the propositions contained in his own book should be regarded as nonsense. Used in this way, "nonsense" does not necessarily carry negative connotations.
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