Sentence:  The gentlemen were still lounging on the gallery, fighting time with newspapers and cigars, for the <WSD>Indian Summer</WSD> kept up a charming pretense that Winter had forgotten to cross the water; ... 
Meaning of the word marked with <WSD> tags:  A stretch of sunny and warm, often hazy, days during late autumn. (from late 18th c., popularized in the early 19th c.)<ref>Matthews (February 1902), page 73.</ref>