Sentence:  The battle of the drib-drool continues , but most of New York 's knowing sophisticates of Abstract Expressionism are stamping their feet impatiently in expectation of V ( for Vindication ) Day , September <WSD>first</WSD> , when Augustus Quasimodo 's first one-man show opens at the Guggenheim . 
Meaning of the word marked with <WSD> tags:  the first element in a countable series