|Acquaintance: direct handling and contact with a subject matter about which statements are to be made as a basis for knowledge. Antonym to knowledge through description.|
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Definition acquaintance/belief content/Russell/Schiffer: one is known with an aptitude Q when Q occurs unaccompanied by a way of givenness in a proposition, which is the full content of a belief - e.g. redness, e.g. squareness? - Problem this is not true for "Dog": this is composed of a natural kind, expertise, denoting, genotype, etc. - some of them we do not know from acquaintance.
Remnants of Meaning Cambridge 1987