I came across the following phrase in www.oxforddictionaries.com : "he set off at dawn". At the same time in this dictionary it is not stated that "dawn" is a mass noun. I would like to ask therefore, why there is no article in front of dawn in the phrase?
1 Answer
Dawn in your examples being used to tell the time
at dawn
at noon
at midnight
at two o'clock
none take articles.
-
1