logical positivism

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A philosophy asserting the primacy of observation in assessing the truth of statements of fact and holding that metaphysical and subjective arguments not based on observable data are meaningless.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun philosophy A 20th century school of philosophy which held that all knowledge is based on logical inferences from empirical observations.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the form of empiricism that bases all knowledge on perceptual experience (not on intuition or revelation)