WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
noun.
the warmest season of the year; in the northern hemisphere it extends from the summer solstice to the autumnal equinox
Word Usage
"M. O'BRIEN: Do you think that in London they'll vote to move what they call summertime to match us or are we going to be the lone wolf in all of this for quite a long time?"