Question

The technical term for informal, conversational speech is a0 speech.

Answer 1

The technical term for informal, conversational speech is a colloquial speech.

Colloquial, conversational, informal refer to sorts of speech or to usages not on a formal level.

Colloquial language refers to the linguistic style used for casual communication. It constitutes the most common functional style of speech, the idiom normally utilized in conversation as well as other informal contexts.  

This linguistic style is characterized by great usage of interjections and other expressive devices.

Answer 2

Answer:

Colloquial

Explanation:

Colloquial language refers to the use of informal, conversational words and phrases. This term is particularly applied to pieces of writing that employ this type of language. Colloquial expressions can also include slang, as they represent speech as it is spoken by people in their daily lives. Although some writers use colloquial speech on purpose, some others do so indadvertedly influenced by the way they speak in their own society.