Indian summer Meaning, Definition & Usage

  1. noun a period of unusually warm weather in the autumn
    Saint Martin's summer.

WordNet


Definitions
  1. in the United States, a period of warm and pleasant weather occurring late in autumn. See under Summer.
Definitions
  1. in North America, a period of warm weather late in autumn, usually characterized by a clear sky, and by a hazy or smoky appearance of the atmosphere, especially near the horizon. The name is derived probably from the custom of the Indians of using this time in preparation for winter by laying in stores of food.

Webster 1913