The Collaborative International Dictionary of English v.0.48:

Linguistics \Lin*guis"tics\ (l[i^][ng]*gw[i^]s"t[i^]ks), n. [Cf.
   F. linguistique.]
   The science of languages, or of the origin, signification,
   and application of words; glossology.
   [1913 Webster] lingulae

WordNet (r) 3.0 (2006):

linguistics
    n 1: the scientific study of language
    2: the humanistic study of language and literature [syn:
       linguistics, philology]

Moby Thesaurus II by Grady Ward, 1.0:

32 Moby Thesaurus words for "linguistics":
   bowwow theory, comparative linguistics, derivation,
   descriptive linguistics, dialectology, dingdong theory, etymology,
   glossematics, glossology, glottochronology, glottology, grammar,
   graphemics, historical linguistics, language study, lexicology,
   lexicostatistics, linguistic geography, linguistic science,
   mathematical linguistics, morphology, morphophonemics, paleography,
   philology, phonetics, phonology, psycholinguistics, semantics,
   sociolinguistics, structuralism, syntactics,
   transformational linguistics