Originally Posted by
cepheid
And here I thought you'd be complaining about the grammatical aspects of "completely full," when "full" already means "at capacity."
No, no, there's actually a meaning to this.
The meaning of the word "full" depends on context. It can legitimately be modified by the word in front of it. For example, "the glass is half full, not half empty." So "half full" means 50% filled, even though the word "full" is used.
And so "completely full" emphasizes 100%, and distinguishes the condition from "half full," "mostly full," "quite full," "not very full," and other such conditions.