A word or phrase used in everyday conversation that is not formal or literary; informal language typical of spoken speech.
From colloquial (from Latin 'colloquium') + -ism (forming abstract nouns). Emerged as a linguistic term in 19th-century language studies to categorize informal speech.
Colloquialisms are language evolution in action—words like 'gonna,' 'yeah,' and 'ain't' started as colloquialisms and are gradually becoming accepted in formal writing, showing how spoken language shapes written standards.
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