summertime  noun (1) Save Word To save this word, you'll need to log in. Log In   sum·​mer·​time | \ ˈsə-mər-ˌtīm  \ Definition of summertime  (Entry 1 of 2) : the summer season or a period like summer summer time  noun (2) Definition of summer time (Entry 2 of 2) chiefly British : DAYLIGHT SAVING TIME Examples of summertime in a Sentence Noun (1) We go there to pick strawberries in the summertime.