A term I use in the connotation of Wittgenstein and Spengler.
According to Wittgenstein : Experience of the same reality that is only possible through use of language. Only a group can share a language (therefore a private language cannot exist and also thoughts which are not shared). Value is extracted from agreements, words are symbols that have the same reference, which is fundamentally sensory data and ‘feelings’ above it.
According to Spengler : A belief, a view of the world as a system of beliefs which certain groups share, e.g. The Faustian West, The Pythagorean / Euclidean Ancient Greeks.