The Collaborative International Dictionary of English v.0.48:
Squirarchy \Squir"arch*y\ (-[y^]), n. [Squire + -archy.] The gentlemen, or gentry, of a country, collectively. [Written also squirearchy.] [1913 Webster]WordNet (r) 3.0 (2006):
squirearchy n 1: the gentry who own land (considered as a class) [syn: landed gentry, squirearchy]