Planning and Research: Definitions

Culture: 

1. The customs, arts, social institutions, and achievements of a particular nation, people, or other social group.

2. The attitudes and behavior that are characteristic of a particular social group or organisation.

http://en.wikipedia.org/wiki/Culture



Subculture: 
A social group within a national culture that has distinctive patterns of behavior and beliefs

wordnetweb.princeton.edu/perl/webwn