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Actually, a great deal of science is based on physical primatives, which while somewhat arbitrarily defined (time, space, etc), are not relative to any other measure. In that sense, no matter what language or inertial frame you choose to use them in, they are consistant. Being an "absolute" (which doesn't really mean anything) doesn't matter.
To wit- science and engineering is the search for the correct, not the absolute. If you build a bridge and it stands, you are correct- the math was valid, the physical theory sound. If the bridge falls, you were wrong.
Also, from engineering we find that even being totally correct is not necessary. It's only necessary to be close to correct, the degree of which is defined by life time of the bridge, liability, standards set by engineering bodies, and so on.
While the reality of language limiting thought is a bummer, it's not so bad that you still can't make actual progress. Hell, study quantum mechanics some time, then tell me you really give a tin shit about "absolutes".
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