In grammar a predicate is a part of a sentence. More particularly, the predicate is further information about the subject - what the subject is doing, what the subject is like, etc. It's really that part of the sentence which is not the subject! See sentence (linguistics).
In Bertrand Russell's theory of types, a predication is an act of typing, that is, assigning a type. A definite description in fact contains a claim of existence.
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