Meta description: It is the data that explains about the data contained in a database. Hence a dictionatary contains only meta descriptions and datatypes.
Meta description is a rather unusual term, normally it´s meta-data.
Anyway, what meta in this conclusion means is that it´s not real data, like you store it in a database or a variable, but it´s the things describing the real data.
e.G. The definition/deklaration of a variable is a meta description for the real data it can contain later.
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