Noam Chomsky, in particular, says flatly and often that he has very little concern for language in and of itself; never has, never will. His driving concern is with mental structure, and language is the most revealing tool he has for getting at the mind. Most linguists these days follow Chomsky's lead here.

Language was just that thing that happened when you opened your mouth at the table, squeezed a few noises out of your vocal chords, and induced Socrates thereby to pass the salt.

Sound is the hard currency; meaning is the network of cultural and formal conventions that turns it into a stick of gum at thecandy store.

Moving in the conventional direction, phonetics concerns the acoustic dimensions of linguistic sound. Phonology studies the clustering of those acoustic properties into significant cues. Morphology studies the clustering of those cues into meaningful units. Syntax studies the arrangement of those meaningful units into expressive sequences. Semantics studies the composite meaning of those sequences.

Nor does linguistics need the nominal blessing of science. It is some sort of systematic, truth-seeking, knowledge-making enterprise, and as long as it brings home the epistemic bacon by turning up results about language, the label isn't terribly important. Etymology is helpful in this regard: science is a descendant of a Latin word for knowledge, and it is only the knowledge that matters.