I came across the following paragraph,
When I first wrote the book in 1975 and 1976 the word and concept of Post-Modernism had only been used with any frequency in literary criticism. Most perturbing, as I later realized it had been used to mean 'Ultra-Modern'... While I was aware of these writings... I used the term to mean the opposite of all this...
I didn't get the meaning of any in the first sentence. Was the author trying to emphasize the high or low frequency, or else? Any help is appreciated!