Sentence:  What makes this particular period so interesting is the remarkably volatile nature of the land market in Scotland; an enormous amount of land changed hands, and some minor noble families made quite staggering inroads into the highest levels of <WSD>landed society</WSD>. 
Meaning of the word marked with <WSD> tags:  A British socio-economic class of landowners, socially just below the aristocracy or peerage, who could live entirely from rental income.