Origin: Latin suffix -al
Colloquial has 3 different meanings across 1 category:
A colloquial word or phrase, colloquialism
characteristic of informal spoken language or conversation
"wrote her letters in a colloquial style"
"the broken syntax and casual enunciation of conversational English"
Denoting a manner of speaking or writing that is characteristic of familiar conversation, of common parlance; informal.
The word "colloquial" comes from the Latin colloquium, meaning "conversation." It is formed by combining the prefix con- ("together") with loquor ("to speak").