Definitions from Wiktionary ( )

▸ noun:  Letters or words, in writing or speech, that have no meaning or pattern or seem to have no meaning.
▸ noun:  An untrue statement.
▸ noun:  That which is silly, illogical and lacks any meaning, reason or value; that which does not make sense.
▸ noun:  Something foolish.
▸ noun:  (literature) A type of poetry that contains strange or surreal ideas, as, for example, that written by Edward Lear.
▸ noun:  (biology) A damaged DNA sequence whose products are not biologically active, that is, that does nothing.
▸ verb:  To make nonsense of;
▸ verb:  To attempt to dismiss as nonsense; to ignore or belittle the significance of something; to render unimportant or puny.
▸ verb:  (intransitive) To joke around, to waste time
▸ adjective:  Nonsensical.
▸ adjective:  (biochemistry) Resulting from the substitution of a nucleotide in a sense codon, causing it to become a stop codon (not coding for an amino-acid).

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