Speech also contains nonverbal elements known as paralanguage.
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Because of the lack of paralanguage online, if you don't explain things clearly people will probably assume all kinds of nasty things, and that's how edit wars get started.
From the en.wikipedia.org
Speech contains nonverbal elements known as paralanguage, including voice quality, rate, pitch, volume, and speaking style, as well prosodic features such as rhythm, intonation, and stress.
From the en.wikipedia.org
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The use of manner of speaking to communicate particular meanings
Paralanguage refers to the non-verbal elements of communication used to modify meaning and convey emotion. Paralanguage may be expressed consciously or unconsciously, and it includes the pitch, volume, and, in some cases, intonation of speech. ...
The semi-verbal responses we make during a conversation, such as "um" and "uh-huh."
The use of accent, cadence, pitch, and tone to convey meaning.
The set of nonphonemic properties of speech, such as speaking tempo and vocal pitch, that can be used to communicate attitudes or other shades of meaning. See also: paralinguistic.
The non-verbal features that accompany speech and help convey meaning. For example, facial expression, gesticulation, body stance, and tone can help convey additional meaning to the spoken word; these are all examples of communication through paralanguage.
Vocal (but nonverbal) dimension of speech; the manner in which something is said rather than what is said. [IRW] The way we vocalize, or say, the words we speak. [SB]
Communication that involves aspects of speech such as rate of talking and tone of voice but not the words used