William mountain's definition of linguistics in contrast with other definitions

INSTRUCTIONS:

Find four different definitions of Linguistics and contrast them with William Moultain’s definition presented in the book. Write the results of your comparisons. Please include thereferences.
1) Linguistics is the study of the nature, structure, and variation of language, including phonetics, phonology, morphology, syntax, semantics, sociolinguistics, and pragmatics. |*Reference:
The American Heritage® Dictionary of the English Language, Fourth Edition copyright ©2000 by Houghton Mifflin Company.

*In contrast with William Moulton:

William Moulton stressesthe importance of both theory and practice which share elements of many other disciplines, such as the ones mentioned before in this definition. For instance each one of these focuses on onefundamental aspect.

2) Linguistics is the study of languages, spoken and written, including how they are used and how they develop. Language is central to our human nature, and linguistics is thesystematic study of human language.

*Reference:
©2010 Department of Linguistics, Faculty of Modern & Medieval Languages, University of Cambridge.

*In contrast with William Moulton:

According toMoulton, linguistics has been described as being, at one and the same time, the most scientific of the humanities and the most humanistic of the sciences instead of a merely descriptive process,which we can inferred from this definition and its conditional systematic study of a language.

3) Linguistics is the scientific study of human language through many approaches to the study oflanguage, emphasizing different scientific traditions and aspects of the subject.

*Reference:
Linguistic Society of America (www.lsadc.org)

*In contrast with William Moulton:

William Moultonemphasizes that the language changes through time, its evolution in an historical and diachronically way. One thing that they forgot to mention in this definition is the use of linguistics’ scientific...