Contraction of 'is not,' used to negate the verb 'to be' in the third person singular.
Contraction formed from 'is' plus 'not,' following English patterns of combining auxiliary verbs with negation. The apostrophe marks the omitted letter 'o' from 'not,' standard in English contractions since the 17th century.
This humble contraction demonstrates English's drive toward efficiency in speech - we naturally compress frequent combinations into single units. The missing apostrophe in casual writing reflects how digital communication often prioritizes speed over formal punctuation rules.
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