The difference between Colloquial and Informal
When used as adjectives, colloquial means denoting a manner of speaking or writing that is characteristic of familiar conversation, of common parlance, whereas informal means not formal or ceremonious.
Colloquial is also noun with the meaning: a colloquial word or phrase, colloquialism.
check bellow for the other definitions of Colloquial and Informal
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Colloquial as an adjective (linguistics):
Denoting a manner of speaking or writing that is characteristic of familiar conversation, of common parlance; informal.
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Colloquial as an adjective:
Of or pertaining to a conversation; conversational or chatty.
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Colloquial as a noun:
A colloquial word or phrase, colloquialism
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Informal as an adjective:
Not formal or ceremonious.
Examples:
"an informal get-together"
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Informal as an adjective:
Not in accord with the usual regulations.
Examples:
"an informal agreement"
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Informal as an adjective:
Suited for everyday use.
Examples:
"'informal clothes"
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Informal as an adjective (of language):
Reflecting everyday, non-ceremonious usage.
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Informal as an adjective (gardening):
Not organized; not structured or planned.