|1.||a period of unusually settled warm weather after the end of summer proper|
|2.||a period of ease and tranquillity or of renewed productivity towards the end of a person's life or of an epoch|
|[originally US: probably so named because it was first noted in regions occupied by American Indians]|
A period of unusually warm weather in the fall, often following a seasonable cold spell.
A period of mild, sunny weather occurring in late autumn, usually following a seasonable cold spell. For example, We had two whole days of Indian summer this year, and then it turned cold again. [Late 1700s]