summertime(n = noun.time) summer - the warmest season of the year; in the northern hemisphere it extends from the summer solstice to the autumnal equinox; "they spent a lazy summer at the shore"
is a kind of season, time of year
has parts: june 21, midsummer, summer solstice, canicular days, canicule, dog days

summertime, n. the season or period of summer (cf. summer time).