|Definition - The study of paralanguage, i.e. the non-phonemic but vocal aspects of speech, such as voice tone and speech tempo.|
Etymology - The term derives from the Greek para, beside + linguistics.
Oxford English Dictionary - Its first citation is from 1958:
"A part of communication activity which is outside the area of microlinguistics … is what can be called paralinguistics."
(A. A. Hill Introd. Ling. Struct. xxi. 408)